Author: Roy Eassa
Date: 09:25:19 07/24/01
Go up one level in this thread
On July 24, 2001 at 09:48:29, Ian Kennedy wrote:
>In a recent test game against my computer (which was Black), the following
>postion arose:
>
>[D] 4Nr2/2QR1pkp/4p1p1/8/1p6/r3q1NP/6PK/8 b - - 0 0
>
>I'd gone for a cheapo draw attempt hoping to fool it into playing Rxe8. No such
>luck, it played Kh8 and went on to win.
>
>When I went back to the position after 31. ... Rxe8 to see if there was a draw
>to be had, I was surprised to find its a very forced win for White. But neither
>Crafty or Fritz can see the mate all in one go, even though this line I worked
>out in Fritz has 15 checks out of 20 moves before the final mate:
>
>(31... Rxe8?? 32. Rxf7+ Kh6 33. Rxh7+ Kg5 34. h4+ Kg4
>35. Qc4+ Qf4 36. Qe2+ Rf3 37. gxf3+ Qxf3 38. Qe1 Qf4 39. Qd1+ Qf3 40. Qg1 Qf4
>41. Qg2 Qf3 42. Qh3+ Kf4 43. Rf7+ Ke5 44. Rxf3 Kd6 45. Rd3+ Kc6 46. Qg2+ Kc7
>47. Qc2+ Kb8 48. Qc5 Rf8 49. Qxb4+ Kc7 50. Qc5+ Kb7 51. Rd7+ Ka6 52. Ra7# {
>(Fritz 5)})
>
>Yet Crafty on my PC is only showing +3.65 after an hour or so. Maybe there is
>some inaccuracy in the above variation?
A mate in 21 (41 ply) with quiet moves (non-checks) in the middle is a tall
order for a PC program to see all in one gulp.
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