Studies up to 10 Pieces

[pgn autoplayMode=none][Event "1/2.p. Problem Paradise "]
[Site ""]
[Date "2021.04.03"]
[Round ""]
[White "Michael Pasman"]
[Black ""]
[Result "1/2-1/2"]
[SetUp "1"]
[FEN "5Nr1/8/3kP2r/5P2/8/1N2p2B/4K3/8 w - - 0 1"]
[PlyCount "18"]
[EventDate "2021"]

{,0] Black has 2 strong rooks and White pieces are not well coordinated. How
can White coordinate his pieces better and defend all of them ?} 1. e7 $1 Kxe7
2. Ng6+ Kf6 3. Bf1 $1 (3. Nf4 Rh4 4. Nd5+ Kf7 5. Bf1 Rb8 6. Nc1 Rh2+ 7. Kxe3
Rb1 {White looses one of his pieces}) 3... Rb8 (3... Re8 4. Nf4 Rh2+ (4... Kxf5
5. Kf3 $11) 5. Ng2 Kxf5 6. Nd4+ Ke4 7. Nf3 Rh5 8. Nfe1 Rh2 9. Nf3 $11) (3...
Kxf5 4. Ne7+) 4. Nc5 $1 (4. Nd4 Rh1 $1 {White will loose f1 bishop}) 4... Rb1
$1 (4... Kxf5 5. Ne7+ Kg4 6. Nd5 $11) 5. Nf4 $1 (5. Bg2 Rb2+ 6. Kf3 Rf2+ 7. Kg3
Rxf5 $19) 5... Kxf5 6. Ng2 $1 (6. Nd5 Rh2+ 7. Kd3 Rd1+ $1 $19) 6... Rh2 7. Kd3
$3 ({Logical try :} 7. Ne4 $2 Rb3 $1 8. Nd6+ (8. Nc5 Ra3) 8... Ke5 $1 9. Nc4+ {
and now the black rook is not under attack as in main line, f.e.} Kd4 10. Kf3
e2+ $1 11. Kxe2 Kxc4 $19) (7. Nd3 Ke4 8. Nc5+ Kd5 9. Nd3 Kd4 10. Nde1 Ke4 {
White is in zugzwang}) 7... Rd1+ (7... Rxf1 8. Nxe3+) 8. Ke2 $1 Ra1 (8... Rd5
9. Na4 $1 Rd4 10. Nc3) ({or} 8... Rc1 9. Ne4 $3 Kxe4 {
stalemate, again - no 6.. .Rc3 - as in logical try}) (8... Rb1 9. Kd3 $1 {again
}) 9. Ne4 $3 {White plays this move only with the rook on a1 or c1 Main A :} (
9. Kd3 Ra3+ 10. Ke2 Ke5 11. Nd3+ Kd4 $19) 9... Kxe4 {
ideal stalemate with selfblocks !} ({Main B :} 9... Ke5 10. Ng5 $1 Rh5 11. Nf3+
Ke4 12. Nxe3 Ra2+ 13. Nd2+ Kd4 14. Nec4 (14. Bg2 Re5 $1) 14... Rh2+ 15. Kf3 $11
(15. Kd1 $2 Ra1+ 16. Kc2 Rxf1)) (9... Ra3 10. Nd6+ $1 Ke5 {as in logical try}
11. Nc4+ {and the difference from try - black rook under attack}) 1/2-1/2

[/pgn][pgn autoplayMode=none][Event "1/2.p. Problem Paradise "]
[Site ""]
[Date "2021.10.24"]
[Round ""]
[White "Sergey Osintsev"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "N7/P7/P3K3/7r/p3k3/7B/P1r5/8 w - - 0 1"]
[PlyCount "17"]
[EventDate "2021"]

1. Nc7 $1 (1. Nb6 $4 Rh6+ $1 2. Kd7 (2. Kf7 Rc7+ $19) 2... Rh7+ $19) 1... Rc6+
(1... Rh6+ 2. Kd7 Rd2+ (2... Rh7+ 3. Kd6 $1 Rh6+ 4. Be6 $18) 3. Ke7 $1 Rh7+ 4.
Ke6 $1 (4. Kf6 $2 Rd6+ $11) 4... Rh6+ 5. Kf7 Rh7+ 6. Kg8 $18) 2. Kd7 Rxa6 $1 3.
Bg2+ $1 (3. Nxa6 $2 Rh7+ 4. Kc8 (4. Kc6 Rxa7 5. Nc7 a3 $11 (5... Ra5)) 4...
Rxa7 5. Bg2+ Kd4 (5... Kd3) 6. Bb7 Kc3 7. Kb8 Rxb7+ 8. Kxb7 Kb2 9. Nb4 Ka3 $11
(9... Kc3)) 3... Kd4 (3... Ke5 4. Nxa6 Rh7+ 5. Kc8 $1 (5. Kc6 $2 Rxa7 6. Nc7 a3
$1 7. Kb6 Ra4 $11) 5... Rxa7 6. Bb7 $1 Kd4 7. Kb8 Rxb7+ 8. Kxb7 Kc3 9. Kb6 Kb2
10. Nb4 Ka3 11. Kb5 $18 (11. Ka5)) (3... Kd3 $2 4. Bf1+ $18) 4. Nxa6 Rh7+ 5.
Kc6 $1 (5. Kc8 $2 Rxa7 6. Bb7 Kc3 $1 7. Kb8 Rxb7+ 8. Kxb7 Kb2 9. Nb4 Ka3 $11 (
9... Kc3)) 5... Rxa7 6. Nc7 $1 Ra5 (6... a3 7. Nb5+ $18) 7. Nb5+ Kc4 (7... Kd3
8. Kb6 $18) 8. Bd5+ $1 Kb4 9. a3# 1-0

[/pgn][pgn autoplayMode=none][Event "3.p. Problem Paradise "]
[Site ""]
[Date "2020.12.07"]
[Round ""]
[White "Marco Campioli"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "4R1R1/4PrP1/7K/8/4q1kB/2p5/8/8 w - - 0 1"]
[PlyCount "25"]
[EventDate "2020"]

1. Rgf8 $1 (1. Ref8 $2 Qe6+ 2. Kh7 Qf5+ 3. Kh8 Qh5#) 1... Qe6+ $1 (1... Kxh4 2.
Rxf7 Qe6+ 3. Kh7 Qxf7 4. Rh8 Qxe7 5. Kg6+ Kg4 6. g8=Q $18) (1... Qf4+ 2. Kh7
Kxh4 3. Rxf7 Qxf7 4. Rh8 $18) (1... Qe3+ 2. Kh7) 2. Kh7 c2 $1 (2... Rxg7+ 3.
Kxg7 Kxh4 4. Rf6 Qd7 5. Rh8+ Kg5 6. Rf7 c2 (6... Qd4+ 7. Kg8 $18) 7. Rg8 c1=Q
8. Kh8+ Kh5 9. Rh7+ $18) 3. Rc8 (3. Rxf7 $2 Qxf7 4. Rf8 Qh5+ 5. Kg8 c1=Q $11)
3... Rxe7 (3... Kxh4 4. e8=Q $18) (3... Qe4+ 4. Kh8 Rxg7 5. Kxg7 Kxh4 6. e8=Q
$18) 4. Bxe7 Qe4+ (4... Qxe7 5. Rf6 Qxf6 (5... c1=Q 6. Rxc1 $18) 6. g8=Q+ $18)
5. Kh8 (5. Kh6 $2 Qh1+ 6. Bh4 Qxh4+ $11) (5. Kg8 Qe6+ 6. Kh7 Qe4+) 5... Qh1+ 6.
Kg8 c1=Q 7. Rxc1 Qxc1 (7... Qd5+ 8. Rf7 Qa8+ 9. Bf8 $18) 8. Rf6 $1 Qc7 $1 (8...
Qh1 9. Bd8 Qd5+ 10. Kh7 Qxd8 11. g8=Q+ $18) 9. Rg6+ $1 (9. Kf7 $2 Qc4+ 10. Kf8
Qc8+) (9. Kh8 $2 Qh2+ 10. Kg8 Qc7) 9... Kh5 (9... Kf5 10. Bd6 Qd7 (10... Qc4+
11. Kh7 Qh4+ 12. Rh6 $18) 11. Kh7 Qf7 12. Rh6 Kg5 13. Rh1 $18) 10. Rg5+ $1 (10.
Bd6 Qc2 11. Rg1 (11. Rg3 $2 Qc1 12. Rh3+ Kg6 13. Kh8 Qa1 $1 $11) 11... Qf2 12.
Rh1+ Kg6 13. Kh8 Qd4 $1 $11) 10... Kh6 $1 (10... Kh4 11. Bf6 Qc8+ 12. Kh7 Qc2+
13. Rg6+ $18) 11. Kh8 $1 (11. Kf7 $2 Qf4+ $11) (11. Kf8 $2 Qf4+ $11) 11... Qxe7
(11... Qc3 12. Bb4 Qf6 (12... Qxb4 13. g8=Q $18) 13. Bd2 $18) 12. g8=Q Qxg5 (
12... Qe5+ 13. Rg7 $18 (13. Rxe5 $2 $11)) 13. Qh7# 1-0

[/pgn][pgn autoplayMode=none][Event "sp.p. Problem Paradise "]
[Site ""]
[Date "2021.01.28"]
[Round ""]
[White "Valery Kalashnikov"]
[Black ""]
[Result "1/2-1/2"]
[SetUp "1"]
[FEN "8/8/8/1B1k4/6nr/K1Q4r/8/8 w - - 0 1"]
[PlyCount "15"]
[EventDate "2019"]
[TimeControl "300"]

1. Bd3 $1 (1. Bc6+ $2 Kd6 2. Bf3 Ne5 3. Qd2+ Ke6 $1 4. Qd5+ Kf5 $19) 1... Ne5
2. Qa5+ $1 Kd4 3. Qd8+ $8 Kc3 $1 (3... Kc5 4. Qf8+ Kd5 5. Qg8+ Kd6 6. Qb8+ $11)
(3... Ke3 4. Bf5 Rh2 5. Qe7 Kf4 6. Be6 $11) 4. Bf1 $8 (4. Bf5 $2 Nc4+ 5. Ka2
Rh2+ 6. Ka1 Rh1+ 7. Bb1 Rxb1+ 8. Kxb1 Nd2+ 9. Ka2 Ra4#) (4. Bb1 $2 Nc4+ 5. Ka2
Rh6 6. Qa8 R6h5 $19) (4. Qf6 $2 Kxd3 5. Qxe5 Kc2+ 6. Ka2 Ra4#) 4... Nc4+ 5. Ka2
$8 (5. Bxc4 $2 Kxc4+ 6. Ka2 Rh2+ 7. Ka1 Rh1+ 8. Ka2 R4h2+ $19) (5. Ka4 $2 Nd6+
$1 6. Ka3 Kc2+ $1 7. Bxh3 Nb5+ $19) 5... Rh2+ 6. Ka1 $1 Rd4 7. Qf6 $8 Nd2 8.
Qc6+ $1 1/2-1/2

[/pgn][pgn autoplayMode=none][Event "sp.p. Problem Paradise "]
[Site ""]
[Date "2021.08.09"]
[Round ""]
[White "Vladislav Tarasiuk"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "8/1n4K1/8/6pP/1P6/1p6/7N/6k1 w - - 0 1"]
[PlyCount "25"]
[EventDate "2021"]

1. h6 $1 (1. Nf3+ $2 Kf2 2. Nd2 g4 $11) 1... Kf2 $1 (1... b2 2. Nf3+ Kf2 3. Nd2
Ke2 4. Nb1 $18) (1... g4 2. Nf1 Kxf1 3. h7 g3 4. h8=Q g2 5. Qh3 $18) 2. Nf1 $1
Ke2 (2... Ke1 3. Ne3 b2 4. Nc2+ Kd2 5. Na3 $18) 3. Ng3+ (3. h7 $2 b2 4. h8=Q
b1=Q 5. Qh2+ Ke1 $11) 3... Ke3 4. Ne4 Kd3 (4... Kxe4 5. h7 b2 6. h8=Q b1=Q 7.
Qh7+ $18) (4... b2 5. Nc3 Kd3 6. Nb1 Kc2 7. h7 Kxb1 8. h8=Q Nd6 9. b5 Nxb5 10.
Qh1+ Ka2 11. Qd5+ Ka1 12. Qa8+ $18) 5. Nf2+ Kd2 6. Nd3 Kxd3 7. h7 b2 8. h8=Q
Nd6 (8... b1=Q 9. Qh7+ $18) 9. Qh7+ Kc3 10. b5 $1 (10. Qg6 $2 Nb5 $11) 10...
Nxb5 11. Qh3+ Kb4 12. Qg4+ Ka5 13. Qf5 $18 (13. Qg1 $2 Na3 $1 (13... Kb4 $2 14.
Qb1 Kb3 15. Qd1+ Ka2 16. Qd5+ Ka1 17. Qa8+ $18) 14. Qe1+ (14. Qc5+ Ka4 15. Qd4+
Kb3 $11) 14... Ka4 15. Qd1+ Kb4 16. Qd2+ Kb3 $11) 1-0

[/pgn][pgn autoplayMode=none][Event "1.hm. Problem Paradise "]
[Site ""]
[Date "2021.04.02"]
[Round ""]
[White "Itay Richardson"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "5k2/8/R1p4P/6P1/3P3n/3P3r/8/5K2 w - - 0 1"]
[PlyCount "19"]
[EventDate "2021"]

1. d5 $1 (1. Rxc6 $2 Nf3 2. g6 (2. Rc8+ Kf7 $10) (2. Rc5 Nxd4 $10) (2. Kg2 Nxg5
3. Rc5 Rxh6 $10) 2... Rxh6 3. Rf6+ Ke7 4. g7 Rxf6 5. g8=Q Nxd4+ $10) 1... cxd5
(1... c5 2. Ke2 Ke7 3. g6 Ng2 4. g7 $18) (1... Rh1+ 2. Kf2 (2. Ke2 $2 cxd5 3.
h7 Ng2 $1 4. Kf2 (4. Rh6 Rxh6 5. gxh6 Nf4+ 6. Kf2 Ng6) 4... Rxh7 5. Kxg2 Rh5
$10) 2... cxd5 3. h7 Kg7 4. Rh6 Kh8 5. g6 Rh2+ 6. Kf1 $1 (6. Kg3 {/e3} Nf5+ $10
) (6. Kg1 {/e1} Nf3+ $19) 6... Rh1+ 7. Ke2 Rh2+ 8. Kd1 Rh1+ 9. Kc2 $18) 2. h7 (
2. g6 $2 Nxg6 3. Rxg6 Kf7 4. Rb6 Rxd3 $10) 2... Kg7 (2... Ng6 3. Rxg6 Rxh7 4.
Kg2 Rh4 5. Rf6+ Kg7 6. Kf2 Rh3 7. Rf3 Rh1 8. Ke3 Kg6 9. Kd4 Kxg5 10. Kxd5 $18)
(2... Rh1+ 3. Kf2 $18 {as was seen before}) 3. Rh6 (3. Ra7+ $2 Kh8 $10) 3...
Kh8 (3... Rh1+ 4. Kf2 $18 {as was seen before}) 4. g6 {
threatening: 5. g7+ with 6.h8=Q+} Rf3+ (4... Rh1+ 5. Ke2 $18 {
as was seen before}) (4... Rg3 5. Rxh4 Rxg6 6. Ke2 Re6+ 7. Kd2 Re7 8. Kc3 Re3
9. Rh5 Rg3 10. Rxd5 $18) (4... Nxg6 5. Rxh3 $18) 5. Ke2 (5. Ke1 $2 {/g1} Nxg6
6. Rxg6 Kxh7 $10) 5... Re3+ $1 (5... Nxg6 6. Kxf3 $18) (5... Rf8 6. Rxh4 $18) (
5... Rg3 6. Rxh4 Rxg6 7. Ke3 Rg5 8. Kf4 Rg7 9. Ke5 $18) 6. Kxe3 (6. Kf2 {
/d2/d1/f1} Nf5 $10) 6... Nf5+ 7. Kf3 $1 ({Thematic try:} 7. Kf4 $2 Nxh6 {
mutual zugzwang} 8. d4 (8. Kg5 d4 $1 9. Kf4 (9. Kxh6 {stalemate}) 9... Kg7 10.
Ke4 Kh8 11. Kxd4 Nf5+ 12. Ke5 Ne7 13. d4 Nxg6+ 14. Kf6 Kxh7 $10) 8... Kg7 9.
Kg5 Kh8 $1 10. Kf6 (10. Kxh6 {stalemate}) 10... Ng4+ 11. Kf7 Nh6+ 12. Kf8 Nf5
$10) 7... Nxh6 8. Kf4 {mutual zugzwang - this time Black to move White wins} d4
(8... Kg7 9. Kg5 d4 (9... Kh8 10. Kxh6 {no stalemate}) 10. h8=Q+ $18) 9. Kg5
Kg7 (9... Ng8 10. hxg8=Q+ $18) 10. h8=Q+ $18 1-0

[/pgn][pgn autoplayMode=none][Event "2.hm. Problem Paradise "]
[Site ""]
[Date "2021.01.30"]
[Round ""]
[White "Peter Krug Pavel Arestov"]
[Black ""]
[Result "1/2-1/2"]
[SetUp "1"]
[FEN "8/8/5P1P/K7/4P2P/8/8/6kq w - - 0 1"]
[PlyCount "45"]
[EventDate "2021"]

1. h7 $1 (1. f7 $2 Qf3 2. h7 Qc3+ 3. Ka4 Qc6+ 4. Ka5 Qa8+ 5. Kb5 Kf2 6. e5 Ke3
7. e6 Kd4 8. e7 Qb7+ $19) 1... Qxh4 2. f7 $8 Qd8+ (2... Qf6 3. Kb4) 3. Kb5 $1 (
3. Kb4 $2 Kf2 4. e5 Ke3 5. e6 Kd4 6. e7 Qb6+ $19) 3... Qh8 $1 (3... Kf2 4. e5
Ke3 5. e6 Kd4 6. e7 Qb8+ 7. Kc6 $1 $11) 4. Kc4 $1 (4. Kc6 $2 Qf6+ 5. Kd7 Qxf7+
$19) (4. Kb4 $2 Kf2 5. e5 Ke3 6. e6 Kd4 7. e7 Qb8+ $19) 4... Qf6 (4... Kf2 5.
e5 Ke3 6. e6 Qc8+ 7. Kd5 $11) 5. Kb4 $1 (5. Kd5 $2 Qxf7+ $19) (5. Kc5 Kf2 $19)
5... Qe7+ 6. Kc3 $1 (6. Kb5 $2 Qe5+ 7. Kc6 Qe6+ $19) 6... Qe5+ 7. Kb3 $1 (7.
Kd3 $2 Qg7 8. e5 Qxh7+ $19) 7... Qg7 8. Kb4 $1 Qd4+ 9. Kb3 $1 (9. Kb5 $2 Qe5+
10. Kc6 Qe6+ $19) 9... Qd3+ 10. Kb2 $8 Qe2+ 11. Kc3 $1 (11. Kb3 Qf3+ 12. Kb4
Qxe4+ $19) 11... Qf3+ 12. Kd2 $1 Qg2+ 13. Kc3 $1 (13. Ke3 Qg7 $19) 13... Qg7+
14. Kb4 $1 Qf8+ 15. Kb5 $1 (15. Kc3 Kf2 16. e5 Ke3 17. e6 Qc8+ $19) 15... Qh8
16. Kc4 Qc8+ 17. Kd3 $1 (17. Kd5 Qd7+ 18. Ke5 Qe7+ $19) (17. Kd4 Qf8 $1 $19)
17... Qd8+ 18. Kc4 Kf2 19. e5 Ke3 20. e6 Qf6 $1 (20... Ke4 21. e7 Qxe7 22. h8=Q
$11) 21. Kb5 $1 (21. Kd5 $2 Kf4 22. Kd6 Kf5 $19 {i.e.} 23. Kd7 Qxe6+ 24. Kd8
Qh6 25. Ke8 Qxh7 $19) (21. Kc5 $2 Ke4 $1 $19) (21. e7 Qxf7+ $19) 21... Kd3 22.
e7 Qxe7 23. h8=Q $11 1/2-1/2

[/pgn][pgn autoplayMode=none][Event "3.hm. Problem Paradise "]
[Site ""]
[Date "2021.08"]
[Round ""]
[White "Michael Pasman"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "4k3/8/1P3R1K/q3N3/r7/5P2/8/7B w - - 0 1"]
[PlyCount "23"]
[EventDate "2021"]

1. f4 $1 ({Thematic try :} 1. Re6+ Kf8 2. f4 Qd2 $1 3. Rf6+ Kg8 4. b7 Rb4 $11)
1... Rxf4 $1 2. Re6+ $1 (2. Rxf4 $2 Qxb6+ $11) 2... Kf8 (2... Kd8 3. Nc6+ $18)
3. Bc6 $1 (3. Ng6+ $2 Kf7 4. Nxf4 Qf5 5. Re4 Qf6+ $11) 3... Kg8 (3... Qxe5 4.
Rxe5 Rf6+ 5. Kg5 Rxc6 6. Rb5 $18) 4. b7 Qd2 $1 5. Rg6+ $1 (5. b8=Q+ $4 Rf8+ $19
) 5... Kh8 6. b8=Q+ $1 Rf8+ 7. Rg5 $1 Qh2+ (7... Qxg5+ 8. Kxg5 Rxb8 9. Kh6 $18)
(7... Rxb8 8. Nf7#) 8. Rh5 Qxh5+ (8... Qf4+ {/d2} 9. Kg6+ $18) 9. Kxh5 Rxb8 10.
Kh6 $1 Kg8 11. Bd5+ Kf8 (11... Kh8 12. Ng6#) 12. Nd7+ $18 1-0

[/pgn][pgn autoplayMode=none][Event "sp.hm. Problem Paradise "]
[Site ""]
[Date "2021"]
[Round ""]
[White "Jarl Henning Ulrichsen"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "7N/k2r4/2p1R3/4p3/7K/1p6/8/2B5 w - - 0 1"]
[PlyCount "23"]
[EventDate "2021"]

1. Ng6 $1 (1. Rxe5 $2 Rh7+ 2. Rh5 Rg7 3. Rh6 ({( Or} 3. Kh3 Rg1 4. Be3+ Kb7 5.
Bd4 Rb1 6. Kg2 b2 $11 {)}) 3... Rg2 4. Kh3 b2 5. Be3+ Kb7 6. Kxg2 b1=Q $11 {
draws (7 man-EGTB)}) 1... Rd2 $1 2. Bxd2 b2 3. Be3+ (3. Nxe5 $2 b1=Q 4. Nxc6+
$11 {leads to a draw (EGTB).}) 3... Kb7 {
(The best defence. 3â RKa8 4.Re8+ Kb7 5.Ba7! leads to the main line.)} 4. Re7+
Kc8 5. Re8+ Kc7 6. Bb6+ $1 (6. Bd4 $2 b1=Q 7. Bxe5+ Kd7 $11 {
leads to a draw (EGTB).}) 6... Kb7 7. Ba7 $1 Kxa7 8. Ne7 $1 {
Stalemate avoidance} (8. Nxe5 $2 b1=Q 9. Nxc6+ Kb6 10. Rb8+ Ka6 11. Rxb1 {
Stalemate}) 8... b1=Q ({Or} 8... Kb7 9. Nxc6) 9. Nxc6+ Ka6 10. Ra8+ Kb6 11.
Rb8+ Kxc6 12. Rxb1 $18 1-0

[/pgn][pgn autoplayMode=none][Event "c. Problem Paradise "]
[Site ""]
[Date "2021.02.19"]
[Round ""]
[White "Ilham Aliev"]
[Black ""]
[Result "1/2-1/2"]
[SetUp "1"]
[FEN "8/2p5/8/1P6/K7/1P1R4/P1p4k/6r1 w - - 0 1"]
[PlyCount "25"]
[EventDate "2016"]

1. Rc3 $1 ({Thematic try:} 1. Rd2+ $2 Rg2 2. Rxc2 Rxc2 {wins,} 3. b6 Rxa2+ 4.
Kb5 cxb6 $19) 1... c1=Q 2. Rxc1 Rxc1 3. b6 $1 (3. Kb4 $2 {Editor} Kg3 4. a4 Kf4
5. Ka5 Ke5 6. Kb4 Kd5 $19) 3... cxb6 {
(Rc1 could not take "a2"- look thematic try)} 4. Kb5 Kg3 5. Kxb6 Kf4 6. a4 Ke5
7. a5 Kd6 8. a6 Rb1 9. Kb7 $1 (9. a7 $2 Rxb3+ 10. Ka6 Kc7 11. a8=N+ (11. a8=Q
Ra3+) 11... Kc6 $19) 9... Rxb3+ 10. Kc8 $1 (10. Ka8 $2 Kc6) 10... Ra3 11. Kb7
Kd7 12. a7 Rb3+ 13. Ka8 $1 (13. Ka6 $2 Kc7 $1 14. a8=N+ (14. a8=Q Ra3+) 14...
Kc6 $19) 1/2-1/2

[/pgn][pgn autoplayMode=none][Event "sp. c. Problem Paradise "]
[Site ""]
[Date "2021.10.21"]
[Round ""]
[White "Rainer Staudte Michael, Schlosser"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "1k6/8/1p6/1K6/1N6/8/1N6/8 w - - 0 1"]
[PlyCount "23"]
[EventDate "2021"]

1. Kc6 b5 (1... Kc8 2. Nc4 Kd8 3. Kd6 Ke8 4. Ke6 $18) 2. Nd1 (2. N2d3 $2 Kc8 3.
Nf4 Kd8 4. Kd6 Ke8 5. Ke6 Kf8 6. Kf6 (6. Nh5 Kg8 7. Kf6 Kh7) 6... Ke8 $11 (6...
Kg8 $1 7. Ne6 Kh7 8. Kg5 Kg8 9. Kg6)) 2... Kc8 3. Ne3 Kd8 4. Kd6 Ke8 5. Ke6 Kf8
6. Nf5 Kg8 7. Ke7 Kh7 8. Kf7 Kh8 9. Nd5 b4 10. Nf6 b3 11. Nh4 b2 12. Ng6# 1-0

[/pgn]

Studies with over 10 pieces.

[pgn autoplayMode=none][Event "1/2.p. Problem Paradise "]
[Site ""]
[Date "2021.01.08"]
[Round ""]
[White "Peter Krug"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "1q6/1p1bN1B1/1p2pR2/RB2k3/p3N3/6b1/r2P1p1r/5K1n w - - 0 1"]
[PlyCount "35"]
[EventDate "2021"]

1. Ke2 $1 Kd4 $1 (1... Bxb5+ 2. Rxb5+ Kxe4 3. Rxe6+ Kf4 4. Re4+ Kxe4 5. Rb4#)
2. Nf5+ $1 Kd5 (2... Ke5 3. Bd3+ {/c6} bxa5 4. Rf7+ Kd5 5. Ne7#) 3. Ne3+ Kd4 4.
Rf7+ Be5 $1 (4... e5 5. Rxd7+ $18) 5. Rxd7+ Kxe4 6. Bd3+ Kf4 7. Rf7+ Kg3 (7...
Kg5 8. Bf6+ Kh6 9. Rh7#) 8. Nf1+ (8. Bxe5+ $4 Qxe5 9. Rxe5 f1=Q+ 10. Kxf1 Ra1+
$19) 8... Kg2 (8... Kh3 9. Bxe5 Qg8 10. Rf3+ Kg2 11. Be4 Rxd2+ 12. Nxd2 Qg4 13.
Ra8 $18) (8... Kg4 9. Bxe5 Qg8 10. Nxh2+ Kh3 11. Rf3+ Kg2 12. Be4 Kg1 13. Nf1
bxa5 (13... Qg4 14. Bh2+ $18) 14. Bh2+ $18 {leads to mate}) 9. Bxe5 Ng3+ 10.
Nxg3 $1 (10. Bxg3 $2 Qxg3 $11) 10... Qg8 11. Rxf2+ Kg1 12. Rxh2 Kxh2 (12...
Qg4+ 13. Ke3 Kxh2 14. Rb5 Ra3 15. Kf2 Rxd3 16. Nh5+ Kh3 17. Nf4+ Qxf4+ 18. Bxf4
{+-}) 13. Nh1+ $3 {the point} (13. Ne4+ Kg2 14. Nf2 Rxd2+ {=}) 13... Kxh1 14.
Be4+ Kg1 15. Bd4+ Kh2 16. Rh5+ Kg3 17. Be5+ Kg4 18. Bf3# {unterminated} 1-0

[/pgn][pgn autoplayMode=none][Event "1/2.p. Problem Paradise "]
[Site ""]
[Date "2021.04.03"]
[Round ""]
[White "Michael Pasman"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "5N1N/5KB1/7p/b3P2k/p3R2p/5P2/8/3r2q1 w - - 0 1"]
[PlyCount "23"]
[EventDate "21"]

1. Nhg6 $1 {with Nf4+ and Bf6 mating threats} (1. e6 $2 Re1 2. Rxe1 Qxe1 3. e7
Bb4 4. e8=Q Qxe8+ 5. Kxe8 Bxf8 6. Kxf8 h3 $11) (1. Bf6 $2 {f.e.} Rd4) 1... Qg3
(1... Rd7+ 2. Ke6 Qxg6+ 3. Nxg6 Rxg7 4. Nf4+ Kg5 5. Nh3+ Kg6 6. Rxh4 Bd2 7.
Rxa4 $18 {capturing both black pawns and winning with connected e and f pawns})
(1... Rd4 2. Nf4+ $18) 2. Bf6 $1 (2. Nf4+ $2 Kg5 3. Bf6+ Kf5 4. N4e6 Qxf3 5.
Rxh4 Qb7+ 6. Kg8 Rg1+ 7. Kh8 Rg4 8. Rh5+ Rg5 $11) 2... Rd7+ $1 3. Ke8 $1 (3.
Nxd7 $2 Qxg6+ 4. Ke7 Qxe4 5. fxe4 h3) (3. Ke6 Qh3+ (3... Bd2 4. Rxh4+ Qxh4 5.
Nxh4 Rb7)) 3... Bd2 {the only defense against Nf4+} (3... Ra7 4. Nf4+ $18) 4.
Kxd7 {Still Black queen is pinned to defend against mate threats on h4, so
Black has no choice} Bg5 {no other defense against Rxh4+} 5. Nxh4 $1 Bxf6 (5...
a3 6. Nf5 $1 Qh3 $1 7. Ke6 $1 a2 8. Ra4 $18 {Zugzwang !}) 6. exf6 a3 7. Rg4 $1
(7. Ne6 a2 8. Ng7+ Kg5 $11) ({Thematic try :} 7. Nfg6 a2 $1 8. Ra4 Qg5 $3 9.
Rxa2 Qd5+ 10. Ke7 Qxa2 11. f7 Qa3+ 12. Kf6 Qb2+ 13. Ne5 Kxh4 14. f8=Q Qb6+ $1
15. Kg7 Qc7+ $11 {
With perpetual check / or white has to lose his knight or pawn}) 7... Qxh4 $1 (
7... a2 8. Rxg3 a1=Q 9. Rg6 $1 Qa4+ (9... Kxh4 10. f7 $18) 10. Ke7 $18) 8. Ne6
$3 ({Thematic try :} 8. Rxh4+ Kxh4 9. f7 a2 10. Ng6+ Kg5 $1 11. f8=Q a1=Q {
With perpetual check / or white has to lose his knight or pawn}) 8... Qxg4 $1
9. fxg4+ Kg6 10. Ke7 $1 a2 11. f7 a1=Q 12. f8=N# $1 {Model mate} (12. f8=Q {
is perpetual check or white loses g4 pawn after queen exchange}) 1-0

[/pgn][pgn autoplayMode=none][Event "3.p. Problem Paradise "]
[Site ""]
[Date "2021.03.15"]
[Round ""]
[White "Michal Hlinka Lubos Kekely"]
[Black ""]
[Result "1/2-1/2"]
[SetUp "1"]
[FEN "7R/8/b3n3/2p1k3/2q1N1pN/4R1r1/3p2PK/8 w - - 0 1"]
[PlyCount "18"]
[EventDate "2021"]

1. Rh5+ $1 (1. Nxd2+ $2 Rxe3 2. Nxc4+ (2. Rh5+ Kd4 {/f6-+}) 2... Bxc4 $19) 1...
Kf4 (1... Ng5 2. Nxd2+ Rxe3 3. Rxg5+ $11) 2. Nxd2 Qc2 3. Re4+ (3. Rxg3 $2 Bd3
4. Nhf3 Bf5 5. Nf1 Qf2 6. Rxf5+ Kxf5 7. Ne3+ Qxe3 8. Nh4+ Ke4 9. Rxe3+ Kxe3 10.
Nf5+ Kf2 $19) 3... Qxe4 4. Nxe4 Re3 5. Nxc5 (5. Ng3 $2 Bd3 6. Nhf5 Re5 $19)
5... g3+ 6. Kh3 Ng5+ 7. Rxg5 Bc8+ 8. Ne6+ Bxe6+ 9. Nf5 Kxg5 $11 {stalemate} (
9... Bxf5+ 10. Kh4 Re8 11. Rg4+ Bxg4 $11 {stalemate}) 1/2-1/2

[/pgn][pgn autoplayMode=none][Event "sp.p. Problem Paradise "]
[Site ""]
[Date "2021.05.19"]
[Round ""]
[White "Jan Timman"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "r3k3/1p1p2K1/3Pp3/bNp1p1pP/p1P5/3PP3/1P6/8 w - - 0 1"]
[PlyCount "17"]
[EventDate "2021"]

1. Na7 $1 {The same idea with a bishop is known from Pervakov} (1. h6 $4 {
0-0-0! -+}) 1... Bb6 $1 (1... Kd8 2. h6 Rxa7 3. h7 Kc8 4. h8=Q+ Bd8 5. Kf8) 2.
Nc8 $1 (2. h6 $2 Bxa7 3. h7 {0-0-0! =}) 2... Bc7 $1 3. h6 Bxd6 4. h7 $1 (4.
Nxd6+ Ke7 $19) 4... Kd8 (4... Bf8+ 5. Kf6 Rxc8 6. h8=Q $18) 5. Nb6 $1 (5. h8=Q+
Kc7 $11) 5... Rb8 (5... Ke7 6. Nxa8 e4 7. d4 $1 $18) (5... Bf8+ 6. Kf7 $18 (6.
Kg6 $18) (6. Kxf8 $2 Rb8 $11)) 6. h8=Q+ Kc7 7. Na8+ $1 Kc6 8. Qh1+ e4 9. Qxe4#
1-0

[/pgn][pgn autoplayMode=none][Event "sp.p. Problem Paradise "]
[Site ""]
[Date "2021"]
[Round ""]
[White "Andrzej Jasik"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "4K3/8/1np1k3/2b1r1B1/2P1PP2/8/1pP1Q3/6r1 w - - 0 1"]
[PlyCount "21"]
[EventDate "2021"]

1. Qh5 $1 Kd6+ $1 (1... Rexg5 2. Qf7+ Kd6 3. Qe7#) 2. Kd8 $1 (2. fxe5+ $2 Kc7
$19) 2... Bf2 $1 3. Be7+ $1 (3. fxe5+ $2 Kc5 4. Qe2 b1=Q 5. Qxf2+ Kxc4 $11) (3.
Qh8 $2 Nd7 4. fxe5+ Kc5 $11) 3... Rxe7 4. c5+ $1 Bxc5 (4... Ke6 5. Qf5#) 5.
Qh6+ Rg6 $1 (5... Re6 6. Qf8+ Re7 7. Qxe7#) 6. Qxg6+ Re6 7. e5+ (7. Qf5 $2 Nd7
8. e5+ Nxe5 9. fxe5+ Kd5 10. c4+ Kd4 11. Qxe6 b1=Q $11) 7... Kd5 8. Qd3+ Bd4 9.
c3 $1 c5 10. c4+ $1 Nxc4 (10... Kc6 11. Qe4+ Nd5 12. Qxd5+ Kb6 13. Qxe6+ $16)
11. Qf3# 1-0

[/pgn][pgn autoplayMode=none][Event "1.hm. Problem Paradise "]
[Site ""]
[Date "2021.09.23"]
[Round ""]
[White "Amatzia Avni Martin Minski"]
[Black ""]
[Result "1/2-1/2"]
[SetUp "1"]
[FEN "Q2B2k1/P1p5/2P2P2/4p2P/1p2P3/2pp1p2/1br2P2/3K4 w - - 0 1"]
[PlyCount "21"]
[EventDate "2019"]

1. f7+ $1 (1. Be7+ $2 Kh7 $19) 1... Kxf7 2. Bg5 {position Y} Rd2+ $1 (2... Re2
3. Qe8+ {see later}) 3. Ke1 $1 {[#]} ({logical try} 3. Bxd2 $2 c2+ 4. Ke1 Bc3
$19 {position X}) 3... Rd1+ $1 (3... Re2+ 4. Kf1 d2 5. Qe8+ $1 Kxe8 6. a8=Q+
Kf7 7. Qa2+ Kg7 (7... Kf8 8. Bh6+ Ke7 9. Bg5+ Kf8 10. Bh6+ $11 {perpetual check
}) 8. h6+ Kf8 9. Qa8+ Kf7 10. Qa2+ $11 {another perpetual check}) ({similarly} 
3... c2 4. Qe8+ $1 Kxe8 5. a8=Q+ Kf7 6. Qa2+ Kg7 7. h6+ Kf8 8. Qa8+ Kf7 9. Qa2+
$11) 4. Kxd1 {position Y without BRc2} c2+ 5. Ke1 d2+ $1 6. Bxd2 (6. Kxd2 $4
c1=Q+ 7. Kd3 Qc3#) 6... Bc3 $1 {[#] position X without BPd3} 7. Qe8+ $1 (7.
Qf8+ $2 Kxf8 8. a8=Q+ Kg7 $1 $19) 7... Kxe8 8. a8=Q+ (8. a8=R+ $2 Kf7 $1 $19)
8... Ke7 (8... Kf7 $4 9. Qa2+) 9. Qa1 $1 (9. Kf1 $2 Bxd2 $19) 9... Bxa1 10.
Bxb4+ {the move comes with check, and this is why the BK had to be on e7} Ke6
11. Kd2 $11 (11. Ba3 $4 Bc3+ $19) 1/2-1/2

[/pgn][pgn autoplayMode=none][Event "2.hm. Problem Paradise "]
[Site ""]
[Date "2021.12.31"]
[Round ""]
[White "Amatzia Avni"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "2R2N2/8/8/Q5pp/6pk/1P6/1p1P2pK/8 b - - 0 1"]
[PlyCount "18"]
[EventDate "2020"]

1... g1=Q+ (1... b1=Q 2. Ng6+ Qxg6 3. Qe5 $18) 2. Kxg1 b1=Q+ 3. Kf2 (3. Kg2 $2
Qe4+ $11) 3... g3+ 4. Ke3 (4. Ke2 $2 Qe4+ $11) 4... g2 5. Ng6+ $1 (5. Qb4+ $2
g4 6. Ng6+ Qxg6 7. Rc1 Kh3 $11 {e.g.} 8. Qf4 h4 9. Kf2 (9. b4 Qe6+ 10. Kf2 g3+
11. Kg1 Qe1+ $1 12. Rxe1 $11) 9... Qb6+ 10. d4 g3+ 11. Kg1 Qxd4+ $1 12. Qxd4
$11) 5... Qxg6 (5... Kh3 {is defeated by} 6. Rc3 $3 Kh2 (6... g1=Q+ 7. Ke2+) (
6... Qe1+ 7. Kd4+) 7. Qc7+ Kh1 8. Qc6 Kh2 9. Rc1 g1=Q+ 10. Rxg1 Qxg1+ 11. Ke2
Qg4+ 12. Qf3 Qe6+ 13. Kf1 $18) 6. Kf2 $1 (6. Rc1 Qf6 (6... Qd6 $11)) 6... Qf7+
7. Kxg2 Qb7+ 8. Kh2 {
Following a long journey, the king is back where it started} Qxc8 {
Black had finally obtained material equality...} 9. Qb4+ Qg4 (9... g4 $4 10.
Qe7#) 10. Qa4 $1 $18 {A little move which decides the battle.} 1-0

[/pgn][pgn autoplayMode=none][Event "sp.hm. Problem Paradise "]
[Site ""]
[Date "2021.08.31"]
[Round ""]
[White "Peter Krug"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "1R6/P5Q1/8/b6q/2b1NP2/6P1/1PN4P/2k4K w - - 0 1"]
[PlyCount "63"]
[EventDate "2021"]
[TimeControl "300"]

1. Ne1 $3 ({Try} 1. h4 $2 Qd1+ 2. Kh2 Qe2+ $1 (2... Qxc2+ $2 3. Kh3 Be6+ 4. Qg4
{+-}) 3. Kh3 Be6+ 4. g4 Qf1+ 5. Kg3 Qd3+ 6. Kf2 Qxc2+ 7. Ke3 Bd2+ 8. Kd4 Bxf4
9. Rc8 Qxc8 10. Nc5 Qd8+ 11. Ke4 Qd5+ 12. Kxf4 Qd2+ 13. Ke5 Qxb2+ 14. Kxe6 Qxg7
15. a8=Q Qxg4+ {=}) 1... Bxe1 (1... Qd1 2. Qd4 $1 Qxd4 3. a8=Q Bd5 4. Rb4 $3
Qd2 5. Qc8+ Kb1 6. Qc2+ {+-}) 2. Rb3 {!} Qd1 3. Qg4 $1 Qxg4 (3... Be2 4. Kg2 $1
$18) 4. a8=Q Qe2 (4... Ba5 5. Rc3+ (5. Nc3 $2 Bxb3 6. Qxa5 Qf3+ 7. Kg1 Kxb2 8.
Qc5 Qxc3 $11) 5... Bxc3 6. Nxc3 Kxb2 7. Kg2 $1 Kxc3 8. Qf3+ Qxf3+ 9. Kxf3 Kd4
10. Kg4 Bd3 11. Kg5 {+-}) 5. Qa1+ (5. Rc3+ $2 Kb1 $1 6. h4 Qf1+ 7. Kh2 Qe2+ 8.
Nf2 Bxc3 9. bxc3 Qxf2+ 10. Qg2 Qe1 11. f5 Bf1 12. Qf3 Qd2+ 13. Kg1 Bd3 14. Qf2
Qd1+ 15. Kh2 Be4 {=}) 5... Kc2 6. Rc3+ Bxc3 7. Qb1+ Kxb1 8. Nxc3+ Kxb2 9. Nxe2
Bxe2 10. Kg2 Kc3 11. Kh3 Kd4 12. Kh4 Kd5 13. f5 $1 (13. Kg5 Ke6 14. f5+ Kf7 $11
) 13... Kd6 14. Kg5 Ke7 15. Kg6 Bg4 16. h4 Kf8 17. h5 Kg8 18. h6 $1 (18. f6 $2
Be6 $11) 18... Bd1 19. h7+ Kh8 20. f6 Bc2+ 21. Kf7 Bg6+ (21... Kxh7 22. Ke7 Bg6
23. f7 Bxf7 24. Kxf7 Kh6 25. Kf6 Kh5 26. Kf5 Kh6 27. g4 Kg7 28. Kg5 Kf7 29. Kh6
$18) 22. Ke7 Kxh7 23. f7 Bxf7 24. Kxf7 Kh6 25. Kf6 Kh5 26. Kf5 Kh6 27. g4 Kh7
28. Kf6 Kh6 29. g5+ Kh7 30. Kf7 $1 (30. g6+ $2 Kh8 $1) 30... Kh8 31. Kg6 $1 Kg8
32. Kh6 $18 {unterminated !+-} 1-0

[/pgn][pgn autoplayMode=none][Event "c. Problem Paradise "]
[Site ""]
[Date "2021.05.23"]
[Round ""]
[White "Peter Krug"]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "1Q6/3p2p1/8/5p1P/5K2/5nPk/2P1p1pP/4N1nb w - - 0 1"]
[PlyCount "15"]
[EventDate "2021"]
[TimeControl "300"]

1. g4 $1 ({Thematic try} 1. h6 $2 g5+ $3 2. Kxf5 Nd4+ 3. Kf6 Ngf3 4. h7 g1=Q 5.
h8=Q+ Nh4 $1 $11) 1... fxg4 2. h6 $1 ({Try} 2. Kf5 $2 Nh4+ $1 3. Ke4 d5+ 4. Ke3
Nf5+ 5. Kf2 Nf3 6. Nxf3 gxf3 7. Qe5 Kg4 8. h3+ Kg5 9. c4 dxc4 10. h4+ Kxh4 11.
Qf4+ Kxh5 12. Qxf5+ Kh6 $11) 2... gxh6 3. Kf5 Nxh2 4. Qxh2+ {!} Kxh2 5. Kxg4
h5+ 6. Kh4 d6 7. c4 Nf3+ 8. Nxf3# {normal} 1-0

