Author: Lawrence S. Tamarkin
Date: 01:45:59 11/04/98
The position below ocured in the game Blake - Roberts from the 1998 World Open. I tested it against Junior5, Fritz5 16 bit & Genius5. The position after 47.Rd3+ is interesting in itself. Can White win? Is this position known in the endgame books? (I suspect so). Fritz5 & Genius5 find all the drawing variations. I was able to defeat Junior 5 in this ending though and I suspect it is a weaker program in the endgame phase. (other then just the underpromotion bug). Below is the game with some variations from Fritz5 & Genius5... 8/8/8/P7/6Pp/3R2kP/r7/6K1 b - - 0 1 (1) Blake, Michael S - Roberts, Michael J [C48] WO98, 07.1998 8192kB, Jun-book.ctg=351287 pos 1.e4 Nc6 2.Nf3 e5 3.Bb5 Nf6 4.0–0 Bc5 5.Nc3 d6 6.h3 0–0 7.Bxc6 bxc6 8.d4 exd4 9.Nxd4 Bxd4 10.Qxd4 c5 11.Qd3 Bb7 12.Bg5 a5 13.Qf3 Re8 14.Rfe1 Re6 15.Nd5 Rxe4 16.Bxf6 Bxd5 17.Rxe4 Bxe4 18.Bxd8 Bxf3 19.Bxc7 Be4 20.Bxd6 Bxc2 21.Rc1 Bd3 22.Rxc5 a4 23.Rc6 Re8 24.Kh2 f5 25.Rb6 Re6 26.Bc5 Re2 27.Rb4 Kf7 28.Rxa4 Rxb2 29.Ra7+ Kg6 30.Bd4 Rb4 31.Rxg7+ Kh6 32.Rd7 Ra4 33.Be3+ f4 34.Bxf4+ Rxf4 35.Rxd3 Rxf2 36.a4 Ra2 37.Rd4 Ra3 38.g3 Ra2+ 39.Kg1 Kg6 40.Kf1 h5 41.g4 h4 42.Rd6+ Kg5 43.Rd5+ Kf4 44.a5 Ra3 45.Kg2 Ra2+ 46.Kg1 Kg3 47.Rd3+ Result unknown, after 47...Kf4 48.Rd5 Kg3 49.Kfa Kxh3 50.g5 and the 2 passed pawns should win. (That's what I initially thought, now I think its a draw, but I don't trust my limited knoweledge of this type of Rook endgame). Here is a couple of the variations found by the chess programs... [47.Rd3+ Kf4 48.Kf1 Rxa5 49.Ke2 Ra2+ 50.Rd2 Ra3 51.Rd4+ Kg5 52.Rd3 Ra2+ 53.Kf3 Rh2 54.Ke4 Rh1 55.Rd5+ Kg6 56.Rd6+ Kg5 57.Rd3 Rh2 58.Rf3 Rh1 59.Kd5 Rh2 60.Ke6 Rh1 (60...Re2+ 61.Kf7 Re5 62.Rf1 Ra5 63.Kg7 Rb5 64.Rf7 Ra5 65.Kh7 Rb5 66.Rg7+ Kf4 67.Ra7 Kg5 68.Rf7 Ra5 69.Re7) 61.Kf7 Kh6 62.Rf5 Rxh3 63.Rh5#; 47.Kf1 Kxh3 48.g5 A) 48...Kg3 49.g6 (49.g6 Rf2+ 50.Ke1 Rf8 51.a6 Re8+ 52.Kd2 h3 53.Rh5 h2 54.g7 Rg8 55.Rh7 Kg2 56.Kc3 h1Q 57.Rxh1 Kxh1 58.a7 Kg2 59.Kb4 Kf3 60.Kb5 Kg3 61.Kb6 Kf4 62.Kb7 Rxg7+ 63.Kb8 Rg8+ 64.Kb7 Ke5 65.a8Q Rxa8 66.Kxa8) 49...Rf2+ 50.Ke1 Rf8 51.g7 Rg8 52.Rg5+ Kf3 53.Kf1 Kf4 54.Rg1 h3 55.a6 h2 56.Rh1 Kg3 57.Ke2 Rxg7; B) 48...Kh2 49.g6 h3 50.g7 Rg2 51.Rd7 Kh1 52.a6 h2 53.a7 Rxg7 54.a8Q+] 47...Kf4 48.Rd5 Kg3 49.Kf1 Kxh3 50.g5 Rg2 51.a6 Ra2 52.Rd6 Rc2 53.a7 Ra2 54.Rd7 Kg3 55.g6 Rf2+ 56.Ke1 Rf8 57.Rh7 Re8+ 58.Kd2 Rd8+ 59.Ke3 Re8+ 60.Kd4 Rd8+ 61.Ke5 h3 62.g7 Re8+ 63.Kf6 Rc8 64.Rh8 Rc6+ 65.Ke5 Rc5+ 66.Kd4 Line mrslug - the inkompetent chess software addict!
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