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  1. #
  2. #It seems to me that what the computer-chess world needs is something
  3. #like Reinfeld's 1001 position test set, only for "positional" and not
  4. #tactical play.  That is, where the compensation you get for making the
  5. #right move is probably not going to be seen by an evaluation function
  6. #that only knows about material and checkmate. (Unless it looks very
  7. #deep... Or at any rate, if you know more, you are likely to find the
  8. #answer faster...)
  9. #
  10. #The Bratko-Kopec 24 position set was perhaps a step in this direction,
  11. #but is too small. Berliner, Kopec and Northam were attempting to
  12. #construct a large high quality test set with complete coverage of a
  13. #subject classification scheme they'd invented for chess themes...
  14. #(See: Advances in Computer Chess, 6) but they abandoned the project.
  15. #
  16. #I have tried to pick hard examples of a "positional" nature although
  17. #the distinction is blurred (material does matter, some are indeed
  18. #"totally" tactical, and looking ahead far enough would see material
  19. #gain in some of them... also some are easy, not hard... and also it is
  20. #harder to be certain of problem correctness than in a pure-tactics
  21. #test set...)
  22. #
  23. #They include:
  24. #26 Test positions from Raymond Keene & Andrew Whitely:
  25. #Ray Keene's good move guide, Oxford University Press 1982.
  26. #
  27. #10 Test positions from Max Euwe:
  28. #Strategy and Tactics in Chess, David McKay Co., NY.
  29. #
  30. #18 Test positions from Reuben Fine: The world's great chess games,
  31. #Bonanza Books NY 1956. 
  32. #
  33. #25 Test Positions from Aron Nimzowitch: My system, edited by Lou Hays,
  34. #Hays Publishing Inc., Dallas Texas 1991.
  35. #
  36. #10 from F. Reinfeld: The complete chessplayer, Prentice-Hall 1953
  37. #
  38. #10 from H. Berliner, D. Kopec, E. Northam: A taxonomy of concepts for
  39. #evaluating chess strength, Adv. Computer Chess 6, ed. D.F. Beal, Ellis
  40. #Horwood 1991, pages 179-191.
  41. #
  42. #4 from Andrew J. Palay: Searching with probabilities, Pitman 1985
  43. #
  44. #Finally at the end I have appended the Bratko-Kopec set (24) from
  45. #D.Kopec and I. Bratko: A comparison of human and computer performance in chess,
  46. #page 57-72 in  Advances in Computer Chess III,
  47. #edited by M.R.B. Clarke, Pergamon 1982. (These in turn were mostly or
  48. #entirely extracted from Hans Kmoch: Pawn power in chess, Dover publications.)
  49. #
  50. #and 16 test positions from David Levy: "How computers play chess," and
  51. #a few from Levy and R. Keene: How to beat your chess computer, and 8
  52. #other problems.  These were mostly snarfed off the net and are now
  53. #converted to have the same format as the other positions.
  54. #
  55. #Note, the LEVYKEENE set includes some positions *not* featuring a
  56. #single correct move, but instead featuring a definitely incorrect move
  57. #(with "?") which computers might foolishly want to make.
  58. #
  59. #
  60. #begin examples from (Keene)
  61. r1b3k1/1pqnb1pp/p1p1pr2/PPPp1p2/3P4/2B1PN2/2Q1BPPP/R4RK1/w Pb5xPa6 (Keene) #8.
  62. 1q1n4/2p2pbk/Qp1p1npp/1P1Pp3/1P2P3/1B2BP1P/3N2P1/6K1/w Bb3c4 (Keene) #11.
  63. 2krr3/pp3ppp/2b5/6q1/3P4/4N3/PP3PPP/R2Q1RK1/w Ra1c1 (Keene) #12.
  64. 1q2r1k1/r4pp1/p1p4p/2Ppn1b1/5B2/3B2P1/PPQ1RP1P/R5K1/w Bf4xNe5 (Keene) #13.
  65. r4rk1/pp2q1pp/2n1pn2/3p2B1/8/2P3P1/P3PPBP/R2Q1RK1/w Pc3c4 (Keene) #15.
  66. r2qk2r/2p1bppp/p1n1n1B1/1p1pP3/8/2P4P/PP1N1PPN/R1B1QRK1/b Pf7xBg6 (Keene) #16.
  67. 3r1rk1/p3qp1p/2bb2p1/2pp4/8/1P2P3/PBQN1PPP/2R2RK1/b Pd5d4 (Keene) #17.
  68. 6k1/p4p2/2r1p1p1/3p1n2/1q1P3p/1P5P/P3NPP1/1Q1R2K1/b Pa7a5 (Keene) #18.
  69. 1r2q1k1/p1rn3p/1pp1pp2/P2n4/1P1P4/Q4N2/5PPP/2RR1BK1/w Pb4b5 (Keene) #19.
  70. r2qrnk1/pp3bpp/1bp2p2/1P1p4/3P1P2/3BNNP1/P1Q2P1P/R4RK1/b Bf7h5 (Keene) #21.
  71. 6k1/4bpp1/1nq1p2p/pp1b4/3P4/PPQ2BPP/1B1N1PK1/8/b Bd5xBf3+ (Keene) #22.
  72. 2rq1rk1/pp2bpp1/2pn1n1p/3p4/3P1B1P/2NBP3/PPQ2PP1/R3K2R/w Pg2g4 (Keene) #25.
  73. 4r2k/p1p1rpp1/1pbpq2p/4n3/2P1PB2/2P2PP1/P3BR1P/2QR2K1/b Pf7f5 (Keene) #27.
  74. 8/8/4p3/1k1n1p2/pbpP1Pp1/2N3P1/PP6/4BK2/b Bb4xNc3 (Keene) #29.
  75. 3rn1k1/p4p2/2p1p1p1/4P1q1/P1B1N3/1P3R2/2nr1PP1/4RQK1/b Qg5xPe5 (Keene) #32.
  76. 5k2/p1p3p1/8/1p2p3/7P/5PP1/P3KP2/8/b Pa7a5 (Keene) #34.
  77. 4r1k1/p1p3pp/npRb4/5p2/3Pp3/P3B1P1/1P2PPBP/6K1/w Be3f4 (Keene) #35.
  78. 3r1k2/2q4p/4bpp1/1pp1p2n/2n1P3/2P1N1PP/1P2QP1N/R2B2K1/w Ne3d5 (Keene) #38.
  79. r2q1rk1/pppb1ppp/3b1nn1/3Pp1N1/1PB5/P1N1P2P/1B3PP1/R2QK2R/w Ng5e6 (Keene) #41.
  80. r1r3k1/1p1n1pbp/1q1Bp1p1/p3P1N1/PnBp4/1R5P/1P2QPP1/5RK1/b Rc8xBc4 (Keene) #42.
  81. 3r2k1/pp4bp/2n1pnp1/2p5/8/2N1PN2/PP2KPPP/R1B5/w Nf3g5 (Keene) #44.
  82. r2r2k1/ppp2pb1/2n1bnpp/4p3/4P3/2N1BN1P/PPP1BPP1/R2R2K1/b Nf6e8 (Keene) #48.
  83. r1bq2k1/p5bp/3p1nnr/P1pPp3/2P1Pp2/1NN2R1P/4B1P1/1R1QB1K1/b Ng6h8 (Keene) #49.
  84. r3k2r/ppqb2pp/4p3/3pn3/P1p5/B1P5/2P1BPPP/R2QR1K1/w Qd1d4 (Keene) #50
  85. q4r2/1bn1ppkp/3p1np1/1ppP4/r3P3/2PBQNNP/1P3PP1/3RR1K1/w Pe4e5 (Keene) #63
  86. rnbqk2r/p3ppbp/3p1np1/2pP4/2B1P3/2N2N2/PP3PPP/R1BQK2R/w Pe4e5 (Keene) #70.
  87.  
  88.  
  89. begin examples from (Euwe)
  90. 1k1r4/1p6/p1prnp2/P3p1p1/1PP1P2p/5P2/2R1NKPP/1R6/b Rd6d2 (Euwe) #page 24.
  91. 2rr2k1/5pp1/p2qp2p/1p1n4/3P4/1P3N1P/P2QRPP1/2R3K1/b Qd6f4 (Euwe) #page 34.
  92. 1r3rk1/pbpp1qpp/1p1b4/2nN2P1/2PQ1p1P/2B5/PP2PPB1/2KR3R/w Ph4h5 (Euwe) #page 41.
  93. r1bq1rk1/1p1nbppp/p1p2n2/3p2B1/3P4/2NBPN2/PPQ2PPP/R3K2R/w Pg2g4 (Euwe) #page 42.
  94. r4rk1/p3bppp/2p1bn2/1q1p4/N7/4BPP1/PP2P1BP/2RQ1RK1/w Be3c5 (Euwe) #page 46.
  95. r1b1rnk1/1p2qppp/p1p5/3p3n/3P4/P1NBPN2/1PQ2PPP/2R2RK1/w Pb2b4 (Euwe) #page 48.
  96. r1b1r1k1/1p3pp1/p3pq1p/7Q/3P1P2/4P3/P5PP/1BR2RK1/w Pg2g4 (Euwe) #page 55.
  97. 3rr1k1/p1p2ppp/1p3n2/2PP4/8/4BP2/P4P1P/1R1R2K1/w Pd5d6 (Euwe) #page 156.
  98. 6k1/5pp1/2Q4p/1p3q2/1P1P1N2/8/3n1PP1/6K1/w Pd4d5 (Euwe) #page 160.
  99.  
  100.  
  101. begin examples from (Fine)
  102. r1b1r1k1/1pp1n1pp/p1pb1p2/8/4PP2/1NN5/PPP3PP/R1B2RK1/w Pf4f5 (Fine) #page 54.
  103. 8/8/6P1/2k5/4KP2/1p6/1N1r4/8/w Ke4f3 (Fine) #page 58.
  104. 2r1rk2/1b3pp1/p1nq1b1p/1p2p2Q/3pP1NP/3P2P1/PP2B2N/R5RK/b Nc6e7 (Fine) #page 64.
  105. 8/pr2k1pp/8/R7/8/4PK2/P5PP/8/w Ra5a6 (Fine) #page 84.
  106. r2qr1k1/1p3pp1/2b2n1p/p1bpN3/5P2/P1N1P3/1PQ3PP/1B2RR1K/w Pe3e4 (Fine) #page 92.
  107. 6b1/p5k1/2p1q3/5QP1/3PpPp1/P3P1K1/1P6/8/w Kg3xPg4 (Fine) #page 119
  108. 4k3/1R5p/r4pp1/p1P5/3PP3/6P1/6KP/8/w Rb7b6 (Fine) #page 124.
  109. r1bqr1k1/pppn1ppp/3bpn2/3p4/2P5/1P3NP1/PB1PPPBP/RN1Q1RK1/w Pd2d4 (Fine) #page 126.
  110. r1b1kb1r/p2p1pp1/n3pq1p/1NpP4/1pP5/5N2/PP2PPPP/R2QKB1R/w Pe2e4 (Fine) #page 136.
  111. 8/1p1nk1n1/p2p1ppp/P2Pp3/1P2PP1P/4K1PB/8/2B5/w Pf4xPe5 (Fine) #page 173.
  112. 2rr2k1/1p1bbp1p/pn2pp1B/8/8/4PN2/PP3PPP/1BRR2K1/b Nb6a4 (Fine) #page 177.
  113. r1q2r1k/p2n2pp/1p1p1b2/2pP1p2/2P1pP2/1QB1N1P1/PP2P2P/R4R1K/w Ne3xPf5 (Fine) #page 194.
  114. r2q1rk1/pp4pp/2n1p1n1/3pPp2/8/P2B1NQ1/1PP2PPP/RNB1R1K1/b Nc6b8 (Fine) #page 196.
  115. 2r1rnk1/pp3p1p/5bp1/q2p4/2pP4/1PN1PN2/P1Q2PPP/R4RK1/w Pb3b4 (Fine) #page 203.
  116. 2r5/7p/p1n1kn2/Pp2pp2/1P4P1/2NK1P2/1R1N3P/8/b Pe5e4+ (Fine) #page 228.
  117. 3qk2r/3b1pp1/1r1Bp1p1/pp1pP3/n1pP4/2P3Q1/2P2PPP/RR3BK1/b Rb6xBd6 (Fine) #page 240.
  118. r1bq1rk1/pp2ppbp/n4np1/8/2QpP3/2N2N2/PP2BPPP/R1BR2K1/b Pe7e5 (Fine) #page 251.
  119. rn1q1rk1/p3bppp/b3p3/1p1pB3/3P4/2N3P1/PP2PPBP/2RQ1RK1/w Pe2e4 (Fine) #page 255.
  120.  
  121.  
  122. begin examples from (Nimzo)
  123. rnb1kb1r/1p3ppp/p5q1/4p3/3N4/4BB2/PPPQ1P1P/R3K2R/w Ke1c1C (Nimzo) page 169_2.
  124. r2q1rk1/2p1bppp/p2p1n2/2p1p3/4P3/3P1N2/PPP1QPPP/R1B2RK1/w Nf3d2 (Nimzo) planning Nc4 page 176_1.
  125. 3r1k2/3r1pb1/1ppp1qpp/p1n5/2P2N2/1P2PPR1/P2R1P1P/1B1Q3K/b Ph6h5 (Nimzo) #page 179
  126. r4rk1/3q2pp/p2bp3/1b1p1p1n/1p1PP3/6PP/PP1B1PBK/1NRQ2R1/b Pf5xPe4 (Nimzo) #page 181_1
  127. 3r4/pp1rk1pp/n3pp2/8/2RN1P2/4P3/PP2K1PP/2R5/w Pa2a4 (Nimzo) #page 185
  128. 3rqnk1/pb4pp/1p1b1p2/2pP1N2/8/1P1Q4/PB3PPP/1BR3K1/w Bb2xPf6 (Nimzo) #page 192_2
  129. r4rk1/ppp2ppp/2p2q2/4p2b/1b2P3/2NP1N1P/PPP2PP1/R2Q1RK1/w Pg2g4 (Nimzo) #page 197_2.
  130. 2r4r/np1kbppp/1q2p3/pN1pPn2/P2P4/1P3NP1/1B3P1P/R2Q1K1R/w Qd1d3 (Nimzo) NxNa7 is a big mistake. #page 203_1
  131. 8/8/5R2/1k2pp2/3r1P2/2BK4/p7/8/w Kd3c2 (Nimzo) #page 208_2
  132. r2qk2r/pbpnbppp/1p1p1n2/3Pp3/1PP1P3/P1NB1N2/2Q2PPP/R1B2RK1/w Ph2h3 (Nimzo) #page 209
  133. 2rq1rk1/pb1nbpnp/1ppp2pQ/3Pp3/1PP1P1P1/P2B1NN1/1B3P1P/2R2RK1/b Pa7a6 (Nimzo) #page 210
  134. 5rnk/2q1b1np/BpPp2p1/1P2p1P1/4P3/P3QNN1/1B3P2/6K1/b Ph7h6 (Nimzo) #page 211_1.
  135. 4brk1/1pq1b1pp/2p1pn2/2PpNpB1/1P1P2PP/2Q1P3/4BP2/4K2R/w Bg5f4 (Nimzo) #page 214_1.
  136. 1rqn2k1/Rp3b1p/1Pp3p1/N1PpPpPP/5P2/2QBP3/3K4/8/w Pe5e6 (Nimzo) #page 214_3.
  137. r2qkb1r/1p1b3p/p3pppQ/2p5/2P5/4P3/PB1P1PPP/RN3RK1/w Qh6h3 (Nimzo) #page 215_2.
  138. 1r1q1rk1/ppp2ppp/2n1pn2/8/1bNP4/1QN1P3/PP3PPP/R1B2RK1/b Nf6d5 (Nimzo) #page 218_2.
  139. rn3rk1/pp2bpp1/2b1p1qp/2p5/2P1N3/2P3P1/PP2QPBP/R1B2RK1/w Pf2f4 (Nimzo) #page 223_1.
  140. rn1qk1nr/ppp3pp/3bbp2/4p3/4P3/2N2N2/PPPP2PP/R1BQKB1R/w Pd2d3 (Nimzo) #page 225.
  141. 1r2rb1k/3q2pp/2n1bp2/2p1pN2/1pP1P1P1/3PB3/1P1RQN1P/5RK1/b Pg7g6 (Nimzo) #page 226.
  142. r1b2r1k/1pq3pp/p1nb4/5p2/2Bp1P2/3P1QN1/PP1BR1PP/5RK1/w Ng3h1 (Nimzo) #page 228.
  143. r1b2rk1/p2qnppp/1p1p1n2/2p5/2PPpP2/1NP1P2P/P3B1P1/R1B1QRK1/b Ph7h5 (Nimzo) planning Qf5, Qh7 #page 232.
  144. 6k1/ppp3r1/5rp1/1b1p1p1p/2nP1P1P/2P2NR1/q1P1Q1PK/4R1B1/b Nc4d6 (Nimzo) #page 249_2
  145. r3k2r/pp1nnppp/1q2p1b1/4P3/5PB1/8/PP4PP/R1BQNR1K/w Qd1e2 (Nimzo) #page 251_1
  146. r1bqk2r/pp2nppp/2n1p3/2bpP3/8/3B1N2/PPP2PPP/RNBQK2R/w Bc1f4 (Nimzo) #page 258_1
  147. 8/8/8/1p5r/p1p1k1pN/P2pBpP1/1P1K1P2/8/b Pb5b4 (Nimzo) # lund-nimzowitsch
  148.  
  149.  
  150. begin examples from (Reinfeld)
  151. 8/2k3p1/1p2pb1p/p2p3P/P4P2/2PK1P2/8/1R6/w Pc3c4 (Reinfeld) (175, page 108. increases rook mobility)
  152. 6k1/7p/b1p5/5pP1/PBp2P2/7P/8/4K3/w Ph3h4 (Reinfeld) (184, page 125, threatens to make passer, keeping black busy)
  153. 2r2rk1/p1qn1ppp/1p2pn2/8/3P1P2/2PQ4/P3N1PP/R1B2RK1/b Qc7c4 (Reinfeld) (195 page 148. Fixing white's weakness.)
  154. r1b2rk1/4q1pp/4p3/pp1p4/3P4/3QP1B1/P4PPP/R4RK1/w Rf1c1 (Reinfeld) (196 page 148, seizing open file and later getting R on 7th)
  155. 3r4/1p2bp1k/1P1q2pp/1RpPp2n/4P3/4QN1P/2B2PP1/6K1/w Qe3c3 (Reinfeld) (197 page 152. Forces black to weaken his 2nd rank)
  156. 4nr1k/1p1br2p/p1p1pNpN/2PpP1P1/PP1P4/7R/7P/5RK1/w Rh3f3 (Reinfeld) (198 page 152. Forces a protected passer.)
  157. rnbq1rk1/pp3ppp/2p1pn2/8/PbpP4/2N2NP1/1P2PPBP/R1BQ1RK1/b Pc6c5 (Reinfeld) (283 page 247. Doesnt keep the pawn, but keeps pressure)
  158. r2q1rk1/1ppbbppp/p1np1n2/4p3/3PP3/2P2N2/PPB1QPPP/RNB2RK1/b Pe5xPd4 (Reinfeld) (279 page 243. xchging to free his cramped game.)
  159. rnbq1rk1/pp3pbp/3ppnp1/2pP4/2P1P3/2N2N2/PP2BPPP/R1BQ1RK1/b Pe6e5 (Reinfeld) (289 page 254. Keeps lines closed and barricades.)
  160. rn1q1rk1/pp3pnp/3p2p1/2pP2N1/2P5/2P5/P3QPPP/R1B1R1K1/w Ng5e4 (Reinfeld) (290 page 255, accomplishes several positional purposes)
  161.  
  162.  
  163. begin examples from (Berliner-Kopec-Northam)
  164. rnbqk2r/pp2ppbp/5np1/8/2BP4/2N2N2/PP3PPP/R1BQK2R/w Qd1a4+ (Berliner-Kopec-Northam) 
  165. r1b2rk1/4bppp/pqp1pn2/2pp4/3PP3/1P3N2/PBPN1PPP/R2QR1K1/w Bb2a3 (Berliner-Kopec-Northam) 
  166. r2qkb1r/pp1bpppp/2np1n2/8/2BNP3/2N1B3/PPP2PPP/R2QK2R/b Nf6g4 (Berliner-Kopec-Northam) 
  167. rnbqkb1r/1p2pppp/p7/3P4/3Nn3/8/PP3PPP/RNBQKB1R/w Qd1a4+ (Berliner-Kopec-Northam) 
  168. r1bqkb1r/p1p2ppp/2n2n2/1p1Pp1N1/2B5/8/PPPP1PPP/RNBQK2R/w Bc4f1 (Berliner-Kopec-Northam) 
  169. rn2kb1r/1pqbpp1p/p5p1/2nP4/8/4QN2/PP3PPP/RNB1KB1R/w Qe3c3 (Berliner-Kopec-Northam) 
  170. r1bqk2r/ppp1npbp/3p1np1/3Pp3/2P1P1PP/2N1B3/PP3P2/R2QKBNR/w Pf2f3 (Berliner-Kopec-Northam) 
  171. 2r2rk1/pp1b1ppp/1n2pn2/BP6/4P3/P3NP2/3K2PP/R4B1R/w Pa3a4 (Berliner-Kopec-Northam) 
  172. r1bqk2r/pppp1ppp/2n2n2/2b1p3/2P1P3/2N2N2/PP1P1PPP/R1BQKB1R/w Nf3xPe5 (Berliner-Kopec-Northam) 
  173. r2qr1k1/pppb1ppp/2np1n2/2b1p3/2P5/P1NPP1P1/1P2NPBP/R1BQ1RK1/b Pa7a5 (Berliner-Kopec-Northam) 
  174.  
  175.  
  176. begin examples from (palay)
  177. 8/7p/5k2/5p2/p1p2P2/Pr1pPK2/1P1R3P/8/b Rb3xPb2 (palay) (page 58)
  178. 8/p7/1ppk1n2/5ppp/P1PP4/2P1K1P1/5N1P/8/b Nf6g4+ (palay) (page 123)
  179. 8/3b3k/2p5/2Pp2p1/3P4/6P1/8/2K3N1/w Ng1f3 (palay) (page 127)
  180. 1r1r2k1/1bqnbppp/ppp1p3/8/PPNP4/2N1PBP1/2Q2P1P/1RR3K1/b Be7xPb4 (palay) (page 128)
  181.  
  182.  
  183. begin examples from (Bratko-Kopec)
  184. 1k1r4/pp1b1R2/3q2pp/4p3/2B5/4Q3/PPP2B2/2K5/b Qd6d1+ (Bratko-Kopec) bk001
  185. 3r1k2/4npp1/1ppr3p/p6P/P2PPPP1/1NR5/5K2/2R5/w Pd4d5 (Bratko-Kopec) bk002
  186. 2q1rr1k/3bbnnp/p2p1pp1/2pPp3/PpP1P1P1/1P2BNNP/2BQ1PRK/7R/b Pf6f5 (Bratko-Kopec) bk003
  187. rnbqkb1r/p3pppp/1p6/2ppP3/3N4/2P5/PPP1QPPP/R1B1KB1R/w Pe5e6 (Bratko-Kopec) bk004
  188. r1b2rk1/2q1b1pp/p2ppn2/1p6/3QP3/1BN1B3/PPP3PP/R4RK1/w Nc3d5 (Bratko-Kopec) bk005
  189. 2r3k1/pppR1pp1/4p3/4P1P1/5P2/1P4K1/P1P5/8/w Pg5g6 (Bratko-Kopec) bk006
  190. 1nk1r1r1/pp2n1pp/4p3/q2pPp1N/b1pP1P2/B1P2R2/2P1B1PP/R2Q2K1/w Nh5f6 (Bratko-Kopec) bk007
  191. 4b3/p3kp2/6p1/3pP2p/2pP1P2/4K1P1/P3N2P/8/w Pf4f5 (Bratko-Kopec) bk008
  192. 2kr1bnr/pbpq4/2n1pp2/3p3p/3P1P1B/2N2N1Q/PPP3PP/2KR1B1R/w Pf4f5 (Bratko-Kopec) bk009
  193. 3rr1k1/pp3pp1/1qn2np1/8/3p4/PP1R1P2/2P1NQPP/R1B3K1/b Nc6e5 (Bratko-Kopec) bk010
  194. 2r1nrk1/p2q1ppp/bp1p4/n1pPp3/P1P1P3/2PBB1N1/4QPPP/R4RK1/w Pf2f4 (Bratko-Kopec) bk011
  195. r3r1k1/ppqb1ppp/8/4p1NQ/8/2P5/PP3PPP/R3R1K1/b Bd7f5 (Bratko-Kopec) bk012
  196. r2q1rk1/4bppp/p2p4/2pP4/3pP3/3Q4/PP1B1PPP/R3R1K1/w Pb2b4 (Bratko-Kopec) bk013
  197. rnb2r1k/pp2p2p/2pp2p1/q2P1p2/8/1Pb2NP1/PB2PPBP/R2Q1RK1/w Qd1d2 (Bratko-Kopec) bk014
  198. 2r3k1/1p2q1pp/2b1pr2/p1pp4/6Q1/1P1PP1R1/P1PN2PP/5RK1/w Qg4xPg7+ (Bratko-Kopec) bk015
  199. r1bqkb1r/4npp1/p1p4p/1p1pP1B1/8/1B6/PPPN1PPP/R2Q1RK1/w Nd2e4 (Bratko-Kopec) bk016
  200. r2q1rk1/1ppnbppp/p2p1nb1/3Pp3/2P1P1P1/2N2N1P/PPB1QP2/R1B2RK1/b Ph7h5 (Bratko-Kopec) bk017
  201. r1bq1rk1/pp2ppbp/2np2p1/2n5/P3PP2/N1P2N2/1PB3PP/R1B1QRK1/b Nc5b3 (Bratko-Kopec) bk018
  202. 3rr3/2pq2pk/p2p1pnp/8/2QBPP2/1P6/P5PP/4RRK1/b Re8xPe4 (Bratko-Kopec) bk019
  203. r4k2/pb2bp1r/1p1qp2p/3pNp2/3P1P2/2N3P1/PPP1Q2P/2KRR3/w Pg3g4 (Bratko-Kopec) bk020
  204. 3rn2k/ppb2rpp/2ppqp2/5N2/2P1P3/1P5Q/PB3PPP/3RR1K1/w Nf5h6 (Bratko-Kopec) bk021
  205. 2r2rk1/1bqnbpp1/1p1ppn1p/pP6/N1P1P3/P2B1N1P/1B2QPP1/R2R2K1/b Bb7xPe4 (Bratko-Kopec) bk022
  206. r1bqk2r/pp2bppp/2p5/3pP3/P2Q1P2/2N1B3/1PP3PP/R4RK1/b Pf7f6 (Bratko-Kopec) bk023
  207. r2qnrnk/p2b2b1/1p1p2pp/2pPpp2/1PP1P3/PRNBB3/3QNPPP/5RK1/w Pf2f4 (Bratko-Kopec) bk024
  208.  
  209.  
  210. begin examples from (Levy)
  211. r5k1/pppq3p/3bpr2/3p1pN1/8/2P1P1P1/PP3PP1/R2Q1RK1/w Ra1c1 (Levy) (p34. Lawson used this to nearly beat DeepThought. The game continued ...Rg6, 2. Nf3 b5? [correct was 2. ...c6])
  212. r1bqkbnr/pp1p1ppp/2n1p3/8/3NP3/8/PPP2PPP/RNBQKB1R/w Nd4xNc6? (Levy) (is wrong, almost any other move is sensible)
  213. 8/8/2pp3k/8/1P1P3K/8/8/8/w Pd4d5 (Levy) levy1
  214. 8/ppp5/8/PPP3kp/8/6KP/8/8/w Pb5b6 (Levy) Peasent 8 plys Cray Blitz 14 plys levy2
  215. 8/p7/1p1k1p2/1P2pp1p/1P1P3P/4KPP1/8/8/w Pg3g4 (Levy) at 13 plys +500 levy3
  216. 8/pp5p/8/PP2k3/2P2pp1/3K4/6PP/8/w Pc4c5 (Levy) cray 11 plys levy4
  217. 6k1/7p/5P1K/8/8/8/7P/8/w Kh6h5 (Levy) mate in 19 levy5
  218. 8/8/3pkp2/8/8/3PK3/5P2/8/w Ke3e4 (Levy) cray at 21 plys levy6
  219. 8/8/2ppk3/8/2PPK3/2P5/8/8/w Pd4d5+ (Levy) Cray Blitz at 19 plys levy7
  220. 8/2p5/3k4/1p1p1K2/8/1P1P4/2P5/8/w Pb3b4 (Levy) Cray Blitz at 18 plys levy8
  221. 8/k7/3p4/p2P1p2/P2P1P2/8/8/K7/w Ka1b1 (Levy) Cray Blitz at 18 plys sees the win levy9
  222. 8/8/p6p/1p3kp1/1P6/P4PKP/5P2/8/w Pf3f4 (Levy) Cray Blitz at 17 plys levy10
  223. 8/2k5/p1P5/P1K5/8/8/8/8/w Kc5d5 (Levy) easy levy11
  224. 8/5p2/8/4K1P1/5Pk1/8/8/8/w Ke5e4 (Levy) Cray Blitz at 23 plys levy12
  225. 8/7p/2k1Pp2/pp1p2p1/3P2P1/4P3/P3K2P/8/w Pe3e4 (Levy) Cray Blitz at 13 plys sees it wins a pawn levy13
  226. 8/6p1/3k1p2/2p2Pp1/2P1p1P1/1P4P1/4K3/8/w Ke2f2 (Levy) Cray Blitz at 18 plys sees it wins a pawn levy14
  227. 4k3/4Pp2/5P2/4K3/8/8/8/8/w Ke5f4 (Levy) Cray Blitz at 17 plys, PEASENT sees it at 11 plys levy15
  228. 8/1k3ppp/8/3K4/7P/5PP1/8/8/w Kd5d6 (Levy) Cray Blitz at 15 plys levy16
  229.  
  230.  
  231. begin examples from (LevyKeene)
  232. r1b2rk1/ppp1qppp/2n2n2/1B1p4/3P4/PQP1P3/5PPP/R1B1K1NR/w Bb5xNc6? (LevyKeene) (Similarly BxNc6 here is positionally totally wrong; [From Stahlberg-Petrov, Lodz 1938] almost any other move is sensible, Ne2 is probably best)
  233. 2rqr1k1/pb2bp1p/1p2p1p1/n7/B2P4/P1PQ1NP1/3B1P1P/R3R1K1/b Qd8d5 (LevyKeene) (p.17. Browne beat DeepTHought with this xchg sac)
  234. 4n3/1b2q3/p2p4/1p1P2pk/3QP2p/2N1B2P/P5P1/6K1/w Qd4h8+ (LevyKeene) (Mephisto played a4?)
  235. rnbqk1nr/ppppppbp/6p1/8/8/2NP4/PPP2PPP/R1BQKBNR/b Bg7xNc3+? (LevyKeene) (is wrong; d5 or d6 or Nf6 or most anything else is sensible)
  236.  
  237.  
  238. begin examples from (stuart)
  239. 8/8/6p1/7p/7P/8/pk1K4/2R5/w Rc1a1 (stuart) # Solution : 1)Ra1! Ka1 2)Kc2! g5 3)hxg5 h4 4)g6 h3 5)g7 h2 6)g8=Q h1=Q 7)Qg7 mate.
  240. r5k1/1p3p1p/2ppr1p1/p1b1p1q1/2P1P3/3Q1P2/PPP1N1PP/1R3R1K/w Pc2c3 (stuart) (wrong choices: Ng3? QxN!; and f4? exf4)
  241.  
  242.  
  243. begin examples from (others)
  244. 6k1/6P1/1r6/pp5P/2p5/1B5R/7K/8/w Ph5h6 (others) (Benko's Bafflers, chess life August 1992.)
  245. 8/ppp1P1k1/1P6/1b6/1Pr5/1p1p4/P2P4/1K6/w Pb6xPa7 (others) (..bxa2+, 2.Ka1! Rc1+ 3. Kxa2 Rc6 3. e8=N+! Kf7 5. Nxc7 Rc2+ 6. Kb1 and wins. Benko's Bafflers, chess life August 1992.)
  246. q2k1bnr/pp1b1ppp/3p4/8/2Q1P3/6P1/PPP2PB1/R3K2R/w Pe4e5 (others) (Benjamin-Zapata St Martin 1992 rd 5 mv 15)
  247. 8/pk1r1p2/1pqPr1p1/3Rp3/2P5/8/P2Q1PPP/5RK1/w Pc4c5 (others) (Anand-Seirawan Haninge May 1992)
  248.