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Up Topic The Rybka Lounge / Test Positions / These two WAC positions appear to be lost, no matter what.
- - By dcorbit (***) [us] Date 2010-09-04 07:23
Win At Chess, unless you play the suggested move or any other move because all moves lose for both of these positions, as far as I can tell.

r1bqk2r/pp3ppp/5n2/8/1b1npB2/2N5/PP1Q2PP/1K2RBNR w kq - acd 36; ce -157;
pv Nxe4 O-O Qxb4 Bf5 Nf3 Nc6 Qa4 Nxe4 Ka1 a6 Qa3 Re8 Rg1 Rc8 Bd3 Bg6 h4 Qd5 Rc1 Nd4 Rge1 Rxc1+ Bxc1 Nb5 Qb3 Qxb3 axb3 Nc7 b4 Nf6 Rxe8+ Ncxe8 Be2 Nd5 b5 axb5 Bxb5 Nd6 Be2; bm Nxe4; id WAC.223;

r1b1qrk1/1p3ppp/p1p5/3Nb3/5N2/P7/1P4PQ/K1R1R3 w - - acd 36; ce -80;
pv Rxe5 Qxe5 Ng6 hxg6 Qxe5 cxd5 Qxd5 Rb8 Qd4 Be6 Rd1 Rfe8 Qb6 Bf5 Ka2 Be4 g3 Rbc8 Rd2 Bc6 Kb3 Re5 Rd8+ Rxd8 Qxd8+ Re8; bm Rxe5; id WAC.204;

Can anyone find a move sequence to save them from the dust bin?
Parent - - By Dadi Jonsson (Silver) [is] Date 2010-09-18 22:05
I used these two positions as a test case for IDeA in Aquarium beta. I wasn't in a hurry and analyzed them for some days using several instances of Rybka 4. After this I'm sure that there are no hidden resources for White and he is in trouble in both positions. The only caveat is that I replaced a part of IDeA's standard algorithm (The 'Prolongation' stage) with my own script and it's not as well tested as the standard algorithm.

Besides the initial moves you give for the positions, I also tested other moves briefly but they seemed no better. In the end my score for WAC.223 was -1.36 (compared to your -1.57) and for WAC.204 it was -0.76 (you got -0.80).

I combined the analysis of both positions into a single "Master Tree" which is attached if you want to check the variations.
Attachment: WAC.rar (322k)
Parent - By dcorbit (***) [us] Date 2010-09-20 18:21
Thank you very much for this analysis.
Up Topic The Rybka Lounge / Test Positions / These two WAC positions appear to be lost, no matter what.

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