Author: martin fierz
Date: 09:20:46 11/01/03
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On November 01, 2003 at 11:18:56, Cliff Sears wrote: >[d] r3k2r/ppp1bp1p/6q1/4R3/3P2b1/6Pp/PP3P2/RNB1Q1K1 b kq - > >Black to move > >Position from Chess Life (to Evan's Column) pg 9 november 2003 > >Why do some engines suggest Kd8?? Am I missing something? Smarthink out of the >ones >I tested is the only one to see Evan's suggested O-O-O > >Delfi, Gandalf, and Lambchop suggested Kd8. A couple of other >engines suggested O-O the reason the engines suggest 1...Kd8 is simple: it defends the bishop on e7 indirectly. if you were to take it this happens 2. Rxe7 h2+! 3. Kg2 h1Q+ 4. Qxh1 Kxe7 (or ...Qc6+ 5. Kg1 Qxh1+ 6. Kxh1 Kxe7) - black wins the exchange. If white deviates from this with 3. Kxh2? or 4. Kxh1 he is mated instantly. so the whole point of playing 1...Kd8!? is that it refutes 2.Rxe7 because the rook on e7 will be taken by the king on d8 - which obviously would not be the case if you played 1...OOO. it seems that the line given above is easier for the computer to spot than the win after 1...OOO/OO 2. Rxe7 - and therefore it is given as main line for a while, before the program realizes that the bishop on e7 cannot be taken either after OOO/OO. cheers martin
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