www.arves.org - EG234 Quality control.

In EG234 (page 194), Jaroslav Polášek did write an article titled:

Quality Control: Corrections and reconstruction of older EG studies.

(Polasek, Jaroslav 1957)

At the end he points out that the studies can be downloaded from: www.sach.cz/download/eg234_jp.pgn

Below these corrections and the originals from this pgn-file.

If you want to read the complete article with all his comments, become a member of magazine EG

[Event "6.p WCCT7 ty (c)"] [Site ""] [Date "2004"] [Round ""] [White "P2 Costeff, Gady"] [Black ""] [Result "1-0"] [Annotator "Jara"] [SetUp "1"] [FEN "k1q5/2P3PP/p1n5/P7/PP2K3/1Q6/3b2P1/2r3rN w - - 0 1"] [PlyCount "37"] [EventDate "2004"] 
 {1.g8-Q would meet with a black stalemate combination. White can respond apriori by the underpromotion 1.g8R, or postpriori, by 1.g8Q, allowing black's plan and defeating it with a counter idea.} 1. g8=Q $1 ({Logical try:} 1. g8=R Rge1+ 2. Kd3 Ne5+ 3. Kxd2 Nc4+ $1 4. Qxc4 Rcd1+ 5. Kc3 Rc1+ 6. Kb3 Rb1+ 7. Ka3 Ra1+ 8. Qa2 Rxa2+ 9. Kxa2 Re8 $10) (1. h8=Q Rge1+ 2. Kd3 Ne5+ 3. Kxd2 Nc4+ $1 4. Qxc4 Rcd1+ 5. Kc3 Rc1+ 6. Kb3 Rb1+ 7. Ka3 Ra1+ 8. Qa2 Rxa2+ 9. Kxa2 Re2+ $1 (9... Re8 $2 10. Qh6 $1) 10. Kb3 Re3+ 11. Kc2 (11. Kc4 Re8) 11... Re8 $10) 1... Rge1+ 2. Kd3 (2. Kf3 Nd4+ 3. Kg3 Nf5+ 4. Kf3 ({JP} 4. Kf2 Be3+ 5. Qxe3 (5. Kf3 Nd4+ 6. Ke4 $2 Bg1+ $1 7. Kf4 Re8 8. h8=Q Ne2+ 9. Kg5 Be3+ 10. Qxe3 Rxg8+) 5... Rf1+ 6. Ke2 Rfe1+ $11) 4... Nd4+ $10) 2... Ka7 $3 {starting a stalemate combination} (2... Ne5+ 3. Kxd2 Nc4+ 4. Qgxc4 $1 $18 {This is the resource that 1.g8R does not have.}) 3. Qxc8 Ne5+ 4. Kxd2 Nc4+ $1 5. Kd3 $3 (5. Qxc4 Rcd1+ 6. Kc3 Re3+ 7. Kb2 Re2+ 8. Qxe2 Rd2+ 9. Kc3 Rd3+ 10. Kc4 Rd4+ 11. Kc5 Rd5+ 12. Kc6 Rd6+ 13. Kxd6 {stalemate. Therefore white eliminates the stalemate by forcing black to capture Qc8}) 5... Ne5+ 6. Kd4 Nc6+ 7. Kd5 Ne7+ 8. Kd6 $3 Nxc8+ 9. Kd5 $1 (9. Kd7 Re7+ $19) 9... Ne7+ (9... Rcd1+ 10. Kc5 Rc1+ (10... Re5+ 11. Kc4 Rxh1 12. b5) 11. Kd4 Rcd1+ 12. Kc3 Re3+ 13. Kc2 Rxb3 14. h8=Q Rbd3 15. Qh6 $18) 10. Kd4 Nc6+ (10... Rxh1 11. b5) 11. Kd3 Ne5+ 12. Kd2 Nc4+ {same position as after 4..Nc4+ but without Qc8 so there is no longer stalemate} 13. Qxc4 Rcd1+ 14. Kc3 Rc1+ 15. Kb3 (15. Kd4 Rxc4+ 16. Kxc4 Rxh1 17. c8=N+ Kb7 18. Nd6+ Kc6 19. Ne4 Rxh7 $10) 15... Rb1+ 16. Ka3 Ra1+ 17. Qa2 Rxa2+ 18. Kxa2 Rxh1 19. c8=R $1 {the rook promotion of the try reappaers.} (19. c8=Q Ra1+) (19. c8=B Rxh7) 1-0

[Event "6.p WCCT7 ty"] [Site ""] [Date "2004"] [Round ""] [White "P2o Costeff, Gady"] [Black "(+4604.74c3a8) TT"] [Result "1-0"] [SetUp "1"] [FEN "k1q5/2P3PP/p5p1/P5p1/PP4P1/1QK1n3/3p4/r3r2N w - - 0 1"] [PlyCount "35"] [EventDate "2004"] 
 {WCCT7 ty 2001-2004 (EG#14170).} 1. g8=Q (1. g8=R $2 Rac1+ 2. Kxd2 Nc4+ 3. Qxc4 Rcd1+ 4. Kc3 Rc1+ 5. Kb3 Rb1+ 6. Ka3 Ra1+ 7. Qa2 Rxa2+ 8. Kxa2 Re8 9. h8=Q Qe6+ ) (1. h8=Q $2 Rac1+ 2. Kxd2 Nc4+ 3. Qxc4 Rcd1+ 4. Kc3 Rc1+ 5. Kb3 (5. Kd4 Rxc4+ 6. Kxc4 Re8) 5... Rb1+ 6. Ka3 Ra1+ 7. Qa2 Rxa2+ 8. Kxa2 Re8 9. g8=Q Rxg8 10. Qf6 (10. Qe5 Qb7 11. Qxg5 Qxc7 12. Qd5+ Ka7 13. Qxg8 Qc2+ 14. Ka3 Qc3+ 15. Qb3 Qa1+ 16. Qa2 Qc3+) 10... Qxc7 11. Qxa6+ Kb8 12. Kb3 Rf8) 1... Ka7 $1 (1... Rac1+ 2. Kxd2 Nc4+ 3. Qgxc4 Red1+ 4. Qxd1 Rxc4 5. Qf3+ Ka7 6. Qe3+) 2. Qxc8 (2. h8=Q $2 d1=Q 3. Qd4+ Qxd4+ 4. Kxd4 Qxg4+) 2... Rac1+ 3. Kxd2 (3. Kd4 $2 d1=Q+ 4. Qxd1 Rcxd1+ 5. Kc3 Rc1+ 6. Kd4 Rcd1+) 3... Nc4+ 4. Kd3 $1 (4. Qxc4 $2 Rcd1+ 5. Kc3 Re3+ 6. Kc2 Re2+ 7. Qxe2 Rd2+ 8. Kc3 Rd3+ 9. Kc4 Rd4+ 10. Kc5 Rd5+ 11. Kc6 Rd6+ 12. Kxd6) 4... Ne5+ 5. Kd4 Nc6+ 6. Kd5 Ne7+ 7. Kd6 Nxc8+ 8. Kd5 (8. Kd7 $2 Re7+ 9. Kd8 Rcxc7) 8... Ne7+ (8... Rcd1+ 9. Kc5 Rd7 ({possible cook:}  9... Re5+ 10. Kc4 Re4+ 11. Kc3 Re3+ 12. Kc2 Rxb3 13. h8=Q Rbd3 14. Qh2 Rd5 15. Ng3 R1d4 16. Qf2 Kb7 17. Qf3 Nd6 {and it is not clear that white wins}) 10. h8=Q Rc1+ 11. Qhc3 Rxc3+ 12. Qxc3 Rxc7+ 13. Kd4 Rxc3 14. Kxc3) 9. Kd4 Nc6+ ( 9... Rxh1 10. b5 Rxh7 11. Qe3 Rxc7 12. b6+) 10. Kd3 Ne5+ 11. Kd2 Nc4+ 12. Qxc4 Rcd1+ 13. Kc3 (13. Kc2 {<or>}) 13... Rc1+ 14. Kb3 (14. Kb2 {<or>}) (14. Kd4 $2 Rxc4+ 15. Kxc4 Rxh1 $1) 14... Rb1+ 15. Ka3 Ra1+ 16. Qa2 Rxa2+ 17. Kxa2 Rxh1 ( 17... Re8 18. b5 Kb7 19. b6 Rh8 20. Ng3 Rxh7 21. Ne4) 18. c8=R $1 (18. c8=Q $2 Ra1+ 19. Kxa1) 1-0

[Event ""] [Site ""] [Date "2023.09.14"] [Round ""] [White "P3 Polasek, Jaroslav"] [Black "After Votruba"] [Result "1/2-1/2"] [Annotator "Jara"] [SetUp "1"] [FEN "7R/kpq5/P4Qp1/N1p3P1/2p4p/2p4P/2p3r1/2K5 w - - 0 1"] [PlyCount "12"] [EventDate "2023"] 
 1. Nc6+ $1 ({White's king stands in the stalemate. The try} 1. Ra8+ $2 Kxa8 2. axb7+ Ka7 3. Nc6+ Kxb7 4. Nd8+ Ka7 5. Nc6+ {however fails on} Ka8 $1 6. Qf8+ Kb7 7. Na5+ Ka7 8. Nc6+ Kb6 $19 {and the stalemate does not take place.}) 1... bxc6 (1... Qxc6 $2 2. Ra8+ {easiest} (2. Qxc6 bxc6 3. Rh7+ Kxa6 4. Ra7+ $11) 2... Kxa8 (2... Kb6 $4 3. axb7) 3. axb7+ $11) {Votruba's study started in a slightly different position (wRh8->h6, bQc7->d7, +wPg4).} 2. Rh7 ({In my version, White can try} 2. Ra8+ $2 Kxa8 $2 ({Black, however, plays} 2... Kb6 $1 3. Qd8 {note that in a position with +wPg4 this move would not be possible and White would draw this rook ending} Qxd8 4. Rxd8 Rxg5 {and Black wins}) 3. Qh8+ ({or} 3. Qf8+) 3... Ka7 (3... Qb8 4. Qxb8+ Kxb8 5. a7+ Kb7 6. a8=Q+ Kxa8 { stalemate}) 4. Qb8+ $1 Kxb8 (4... Qxb8 {stalemate}) 5. a7+ Kb7 6. a8=Q+ Kxa8 { stalemate}) 2... Rg1+ (2... Qxh7 3. Qg7+ {with stalemate} ({or} 3. Qf7+) ({or}  3. Qe7+)) 3. Kxc2 Rg2+ ({main} 3... Qxh7 4. Qg7+ Qxg7 {stalemate}) ({Unlike Votruba's study, we still need to analyse the move} 3... Rc1+ {The computer sees the draw right away, but it's a bit more complicated for a human:} 4. Kxc1 Qxh7 5. Qxc6 Qe7 6. Kc2 $1 Qe2+ 7. Kxc3 Qd3+ 8. Kb2 c3+ ({po} 8... Qb3+ 9. Kc1 {má bílý k remíze více cest, např.} c3 (9... Qb6 10. Qd7+ Kxa6 11. Qa4+ Kb7 12. Qxc4) 10. Qxc5+ Kxa6 11. Qc6+ Qb6 (11... Ka5 12. Qc5+ Ka4 13. Qa7+ Kb4 14. Qb6+ Ka3 $4 15. Qa5+) 12. Qxc3 Qg1+ 13. Kc2 Qxg5 14. Qc6+) 9. Kb3 $1 c2+ 10. Kb2 Qxa6 {and now draws, e.g.} 11. Qxc5+ (11. Qf6 {also leads to a draw - it prevents the exchange of queens.} c1=Q+ 12. Kxc1 Qc4+ 13. Kb2 Qe4 14. Kc3 $11) 11... Qb6+ 12. Qxb6+ Kxb6 13. Kxc2 Kc5 14. Kc3 $11 {because gaining the g5 pawn is not enough for Black to win.}) 4. Kxc3 Rg3+ ({main} 4... Qxh7 5. Qf7+ Qxf7 {stalemate}) 5. Kxc4 Qxh7 6. Qe7+ Qxe7 {stalemate} 1/2-1/2

[Event "Prachenske noviny 1931"] [Site ""] [Date "2023.09.17"] [Round ""] [White "P4 Polasek, Jaroslav"] [Black "original after Votruba"] [Result "1/2-1/2"] [Annotator "Jara"] [SetUp "1"] [FEN "8/1B3bpq/1B1kN2p/6P1/5P2/4p3/4N3/4K3 w - - 0 1"] [PlyCount "25"] [EventDate "1967"] 
 1. g6 $1 {Forcing Black queen to go into a potential fork.} (1. Bc7+ $2 Kxe6 2. g6 Bxg6) 1... Qxg6 (1... Bxg6 2. N2d4 {např.} Qg8 3. Bc6 Ke7 4. Bd8+ Kd6 5. Bc7+) 2. Bc7+ Ke7 3. Bd8+ Kxe6 {Otherwise, Black can't avoid repeating moves.  [#] Votruba began his study in a position shifted one column to the right, where Black's extra pawn on the queenside allowed Black to win (see P4o).} 4. f5+ $1 {Frees up the f4 square for the knight's fork. Black king will therefore not be able to enter the d3/d5/e6 square.} Kxf5 (4... Qxf5 $2 5. Nd4+ ) 5. Bc8+ Ke4 6. Bb7+ Ke5 (6... Kf5 7. Bc8+) (6... Bd5 7. Bxd5+ Kf5 8. Be6+) 7. Bc7+ Kf6 8. Bd8+ Kf5 9. Bc8+ Be6 {Nothing to do but try the exchange of bishops.} 10. Bxe6+ {But Black didn't help himself much, he can't capture opponent's bishop...} Ke4 11. Bd5+ Ke5 12. Bc7+ Kf5 13. Be6+ {etc. with perpetual check.} 1/2-1/2

[Event ""] [Site ""] [Date "2023.09.12"] [Round ""] [White "P6 Polasek, Jaroslav"] [Black "original after Votruba"] [Result "1/2-1/2"] [Annotator "Jara"] [SetUp "1"] [FEN "3r4/p1p2p1n/k1Pp1p2/5Q2/2pN4/N1n2b1K/1q6/b4Q2 w - - 0 1"] [PlyCount "20"] [EventDate "2023"] 
 1. Nxc4 $1 {It prepares the battery and threatens Qa5 mate.} ({After the tempting} 1. Qxc4+ $2 Kb6 2. Nxf3 Qxa3 {White's attack ends and Black wins, e. g.} 3. Qd4+ (3. Qfd3 Rh8) 3... Kxc6 4. Qxh7 Kb7 {and Black realizes his material superiority, White queen cannot match the opponent's rook with a knight and several pawns, e.g.} 5. Qxf6 Nb5 6. Qxd8 (6. Qff5 Kb6 7. Qhxf7 Rh8+ 8. Kg4 Qc1) 6... Qxf3+ {with the gain of queen h7} 7. Kh2 Be5+ 8. Kg1 Bd4+ 9. Kh2 Qf2+ 10. Kh3 Qf1+ 11. Kg4 Qg2+ 12. Kh5 Qf3+ 13. Kg5 Be3+) (1. Nxf3 $2 Qxa3 2. Qxc4+ Kb6 $19 {see line 1.Qxc4+?}) 1... Ng5+ {Only one defence} 2. Kg3 Nce4+ {Black knight comes to the final stalemate pattern.} 3. Kf4 Qh2+ 4. Ke3 Bxd4+ 5. Kxd4 {White king got into final pattern also.} Ne6+ 6. Qxe6 ({After} 6. Ke3 $2 d5 $1 {even two white queens would not save White.}) 6... fxe6 7. Nxd6+ Qe2 8. Qa1+ Qa2 $1 {A funny defence against the stalemate.} ({e.g.} 8... Kb6 9. Qa5+ ({or} 9. Qxa7+ Kxc6 10. Qxc7+ Kxc7 {stalemate}) 9... Kxc6 10. Qxc7+ Kxc7 { stalemate}) {[#]} 9. Qf1+ $1 ({Black queen is taboo} 9. Qxa2+ $2 Kb6 10. Qb3+ Kxc6 11. Qxf3 f5 $19 {Black wins, White knight d6 is lost.}) 9... Be2 10. Qxe2+ Qxe2 {Votruba's stalemate} 1/2-1/2

[Event "Dagastanskaja Pravda 1934"] [Site ""] [Date "2023.06.22"] [Round ""] [White "P8 Polasek, Jaroslav"] [Black "after Gorgiev"] [Result "1/2-1/2"] [Annotator "Jara"] [SetUp "1"] [FEN "8/8/1PR5/6nn/k4p2/1r6/4B1p1/6K1 w - - 0 1"] [PlyCount "26"] [EventDate "1967"] 
 {Correction and reconstruction} 1. b7 $1 (1. Bd1 $2 Kb5 $1 2. Bxb3 Kxc6 3. Kxg2 Kxb6 $19) (1. Bxh5 $6 Rg3 2. Rc1 Nh3+ 3. Kh2 g1=Q+ 4. Rxg1 Nxg1 5. b7 Rg8 6. b8=Q (6. Bg4 Rxg4 ({but waiting} 6... Ka5 {also wins} 7. Bc8 Nf3+ 8. Kh3 Rg3#) 7. b8=Q Nf3+ 8. Kh3 (8. Kh1 Rg1#) 8... Rg3#) 6... Rxb8 7. Kxg1 Rb2 $19) (1. Kxg2 $2 f3+) 1... Rb1+ $1 (1... Rxb7 2. Ra6+ $1 Kb4 3. Bxh5 f3 4. Bxf3 Nxf3+ 5. Kxg2 $11) 2. Kxg2 f3+ $1 3. Bxf3 (3. Kf2 $2 Rxb7 4. Bxf3 (4. Bd1+ Kb4 5. Rg6 Rb5 6. Bxf3 Rf5 7. Ke3 Rxf3+ 8. Kd4 Rf5) 4... Rf7) 3... Rb2+ 4. Kf1 Ng3+ 5. Ke1 {Gorgiev was missing wBf3 in this position, which allowed Black to win easily after 5...Rb1+ 6.Kf2 Se4+ and Rxb7.} Nxf3+ (5... Nxf3+ 6. Kd1 Ng5 7. Ke1 Rb1+ 8. Kf2 N3e4+) 6. Kd1 Rxb7 7. Rc7 {with a stalemate or a perpetual atack on Black rook:} Rb6 8. Rc6 Rb5 9. Rc5 Rb3 10. Rc3 Rb1+ 11. Rc1 Rb2 12. Rc2 Rb4 13. Rc4 Rxc4 {stalemate.} 1/2-1/2

[Event ""] [Site ""] [Date "2023.06.21"] [Round ""] [White "P9 Polasek after Dolgov"] [Black "original"] [Result "1/2-1/2"] [Annotator "Jara"] [SetUp "1"] [FEN "5k2/8/1P6/7R/r7/4n3/7K/B3b1n1 w - - 0 1"] [PlyCount "22"] [EventDate "1967"] 
 {[1 point]} 1. b7 {+1=1} ({A well-known saying goes that the threat is stronger than its execution. Therefore,} 1. Rh8+ $2 {is premature. After} Kf7 { , White would be lost:} 2. b7 Nf3+ 3. Kh3 Ng5+ 4. Kh2 Bg3+ 5. Kxg3 Nf5+ 6. Kf2 Ra2+) 1... Nf3+ 2. Kh3 ({The stalemate attempt} 2. Kh1 $6 {fails, after} Bg3 $1 {Black king escapes, e.g.} 3. Be5 Bxe5 4. Rh8+ Kg7 5. Rg8+ Kh7 6. Rh8+ Bxh8 7. b8=Q Ra1+ {vith mate.}) 2... Ng5+ $1 3. Kh2 (3. Rxg5 $2 Rh4#) 3... Bg3+ $1 ( 3... Ra2+ 4. Kh1 $1 Bg3 5. Bg7+ Kf7 6. Rxg5) (3... Rb4 4. b8=Q+ Rxb8 5. Rh8+) 4. Kxg3 {[+1=2 points]} Nf5+ 5. Kf2 Ra2+ 6. Bb2 $1 {[+2=4 points]} (6. Ke1 $2 Nf3+ 7. Kd1 Ne3+ 8. Kc1 Rc2+ 9. Kb1 Nd2#) 6... Rxb2+ 7. Ke1 {Dolgov's position. } Nf3+ 8. Kd1 Ne3+ (8... Ne7 9. Rh8+ $1 Ng8 10. Rh7 $1 Ne7 (10... Ne5 11. Rc7 Ne7 12. Rc8+ $1) (10... Rd2+ 11. Kc1 Rd8 12. Rc7 Ne7 13. Rc8) 11. Rh8+ { with a positional draw}) 9. Kc1 Rxb7 10. Rh8+ Kg7 11. Rh7+ {[+1=5 points]} Kxh7 {stalemate.} 1/2-1/2

[Event "for Solving Championship CZE 2023"] [Site ""] [Date "2023.08"] [Round ""] [White "P10 Polasek, Jaroslav"] [Black "Cs. sach 9/2023"] [Result "1-0"] [Annotator "Jara"] [SetUp "1"] [FEN "8/2p5/2R5/3P1r1N/2B1K3/8/1p2b3/5k2 w - - 0 1"] [PlyCount "17"] [EventDate "2023"] 
 {After Frantisek Richter} 1. Ng3+ $1 {[0,5 point]} Kg2 $1 ({Most of the solvers did not find this move at all and only indicated a weak retreat of the king to a future check} 1... Kf2 2. Ba2 Bd3+ 3. Kxd3 Rxd5+ (3... b1=Q+ 4. Bxb1 Rxd5+ 5. Kc4 Rd1 6. Ne4+ $18) 4. Kc4 Rd1 5. Ne4+ Ke3 6. Nc3 $18) 2. Ba2 Bd3+ $1 3. Kxd3 {[+0,5=1 point]} (3. Kd4 $2 Rf3 $11) 3... b1=Q+ (3... Rxd5+ $2 4. Bxd5+ { with check}) 4. Bxb1 Rxd5+ 5. Kc4 $1 {[+1,5=2,5 points]} (5. Ke4 $2 Rb5 $1 6. Bd3 Rb4+ $11) 5... Rd1 6. Bc2 Rc1 7. Rg6 {[+2=4,5 points]} Rxc2+ {The original Richter position was created. However, his study was unsolvable, because on P. 11 he had a knight on c2 (instead of a bishop) and Black could draw after 7... Kh2! 8. Kc3 Rg1.} (7... Kh2 8. Kc3 Rg1 {Here White's rook is guarded by the bishop from c2, so White wins for example} 9. Ne2) 8. Kb3 {[+0,5=5 points] Domination!} Rc5 (8... Rc1 9. Ne2+) (8... Rd2 9. Ne4+) (8... Rf2 9. Ne4+) 9. Ne4+ 1-0