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Coko
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Apparently due to a [[Engine Testing#bugs|bug]], Coko III found other moves better than mate in one and threw the win ...
<pre>
[Event "ACM 1971"][Site "Chicago"][Date "1972.08.03"][Round "2"][White "Coko III"][Black "Genie"][Result "0-1"] 1.d4 d5 2.Nf3 Nf6 3.Bg5 Bg4 4.Nc3 Ne4 5.Ne5 Be6 6.Nxe4 dxe4 7.c4 Nd7 8.Nxd7 Bxd7 9.e3 f6 10.Bf4 Be6 11.Qh5+ Kd7 12.d5 Bg8 13.Qf5+ e6 14.dxe6+ Bxe6 15.Qxe4 c6 16.Rd1+ Ke8 17.Rxd8+ Kxd8 18.Qxe6 Bb4+ 19.Ke2 Re8 20.Qg4 g6 21.Qh4 g5 22.Qxh7 Be7 23.Qd3+ Kc8 24.Bd6 Kd7 25.Bxe7+ Kxe7 26.Qh7+ Ke6 27.Qe4+ Kd6 28.c5+ Kxc5 29.Qd4+ Kb5 30.Kd1+ Ka5 31.b4+ Ka4 32.Qc3 Rad8+ 33.Kc2 Rd2+ 34.Kxd2 Rd8+ 35.Kc2 Rd2+ 36.Qxd2 Ka3 37.Qc3+ Kxa2 38. Kc1 f5 39. Kc2 f4 40. Kc1 g4 41. Kc2 f3 42. Kc1 fxg2 43. Kc2 gxh1=Q 44. Kc1 Qxf1+ 45.Kd2 Qxf2+ 46.Kc1 Qg1+ 47.Kc2 Qxh2+ 48.Kc1 and resigned later Qh1+ 49.Kc2 Qb1+ 50.Kd2 g3 51.Qc4+ Qb3 52.Qxb3+ Kxb3 53.e4 Kxb4 54.e5 g2 0-1
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