Author: h.g.muller
Date: 10:32:50 03/02/06
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(I must have hit a wrong key, somewhere, because suddenly the thing got posted before it was finished...) With Kings the Queen's wing has only ~192M positions, and that is not asking too much for computing a complete TB of this 9-men end-game. (Would perhaps take 3-5 minutes, if you declare promoted positions without an enemy pawn on the 7th as won.) This TB would reveal that the situation is always lost with 'swapped' Kings, unless the black King is really much closer to the Pawns then the white one. (Some specialized chess knowledge would reveal this too, of course.) For a specific position of the Kings (W:f5, B:f3) my minimalist engine would find the promotion in 37 sec through ordinary search, where in essence it builds the TB in its hash table. A specialized retrograde TB builder would be at least 10 times faster. A search for the play on the King's wing, probing this TB, would only have to be extremely shallow to show that any forcing by black on this wing would lead to forced clearing of this wing, and manouvre black in the lost position of the TB...
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