Author: Anthony Cozzie
Date: 16:14:00 12/14/03
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On December 14, 2003 at 19:00:39, Richard Pijl wrote: >On December 14, 2003 at 18:33:49, Anthony Cozzie wrote: > >>On December 14, 2003 at 15:18:46, Richard Pijl wrote: >> >>>In a very recent game between Baron and Amateur (time control 45 10) on ICC, the >>>following position occurred: >>> >>>[D]7k/2B2pp1/2n1b3/P2p2Pp/2p4n/4NP2/5K2/5B2 w - - 0 55 >>> >>>White is two pawns down, both passers. As compensation, White has a pair of >>>bishops. Understandably, Amateur showed a big plus score (+3.4), however The >>>Baron thought is was almost drawn (-0.34). What do your engines think about >>>this? >>> >>>The game ended in a draw after many more moves. >>>Richard >> >>Zappa prefers black: >> >>1. a6 Kh7 2. Bb8 Kg6 3. f4 Nf5 4. a7 Nxa7 5. Bxa7 h4 6. Nxf5 Kxf5 7. Ke3 f6 >> = (-1.34) Depth: 14/31 00:01:16.17 32035kN >> > >I get the impression that this line is a draw line. >Zappa sac's the knight at a7, let the remaining knight be exchanged. Black would >have 3 pawns (all passers) against a bishop + the bishop pair advantage. >But the connected passers are blocked by the king, no way to advance there >without the assistance of the black king, and the h-pawn cannot advance without >king assistance either. > >But it's good to see that also other engines see a significant 'compensation' >for white for the two pawns, despite the connected passers. > >After seeing other engine's analysis, and a session with Dieter "Yace" Bürßner >I'm starting to believe this is a drawn position. > >Richard. > >>anthony Probably true. Zappa evaluates its line as +1 because of the split passers. I think if (in the position at the end of its search) the knights were all switched with bishops black would win. Maybe I should add some code where "if pieces remaining == bishops" -> "value passed pawns/split passed pawns less". Still there is no way the position is +3 for black. anthony
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