Author: martin fierz
Date: 13:38:35 02/28/02
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On February 28, 2002 at 15:00:03, Les Fernandez wrote: >[D]8/4b1k1/R5pp/2p1pp2/1pQq4/1P1P3P/1P3PPK/8 w - - > > >I am interested to know if the above position can be held by black. White is >short on time but can force perpetual by Qe6. Although a rook is better then a >bishop, most of the time, should white exchange queens here? I am only an >average player but after doing a little analysis on this position Crafty reports >the following on a fairly slow machine. (Pentium 350, 256 mb ram) > >8/4b1k1/R5pp/2p1pp2/1pQq4/1P1P3P/1P3PPK/8 w - - acd 15; acn 170618898; acs 900; >ce 155; pv Kg1 Qxc4 bxc4 h5 g3 Kf7 Kg2 Bf6 Rc6 Be7 Kf3 g5; > >Although white is reported to have a 1.55 advantage after Kg1 I wonder if the >position can be held by black. I also took a look at the position with white >taking the queen and the ce still appeared about the same with black capturing >white queen with cxd4. > >8/4b1k1/R5pp/2p1pp2/1p1Q4/1P1P3P/1P3PPK/8 b - - acd 17; acn 186582676; acs 902; >ce -151; pv cxd4 Kg3 Kf7 Kf3 h5 Rc6 Bf6 Rb6 Be7 g3 Bf8 h4 Be7; > >Question is with queens off the board can the white rook start chopping up the >black pawns while the black bishop exists? Can someone run this on better >hardware and tkae it a bit deeper to see what falls out? > >Thanks i guess exchanging the Q is a simple win, e.g. with qxd4 cxd4 g4. you can't allow the f5-pawn to move, else white wins immediately by putting his K on e4. so you have to do nothing, i go gf5 gf5 and then it depends a bit on how you did nothing on the last move. if you chose qxd4 cxd4 g4 h5 gf gf then f4! kills black. if you chose qxd4 cxd4 g4 bg5 gf gf then i go rb6 be7 f4 again, or rb6 bd2 kg2 with the simple idea of kf1-e2 and you lose b4. maybe you have to refine these lines, i just ran this on my brain, version 1.0 :-), but there is actually a general principle at work here: being an exchange up is good, but not decisive, while one rook vs. one minor piece is usually just a simple win. you can see in the above lines that i need to make myself some breathing space for the rook and the king. keeping the queens on is a serious mistake for humans, because it invites counterplay. aloha martin
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