peter wrote: as long as I'm not shown anything new
How easily Whtie can fail can be seen here again.
SF (as far as I remember at about depth 50) with full Syzygys played
[d]6k1/pp3p2/6p1/3p4/2pN4/P1P2P1P/1P1qR1P1/6K1 b - - 0 1
1... Qc1+ 2. Kf2 Kg7 3. Kg3 (?) Qg1 4. h4 (?)
and from that onwards Black's evals start rising on and on.
4...a6 5. Kg4 Qc1 6. Kg3 b5 7. Kg4 Kf6 8. Rf2
Qg1 9. Kg3 Qe1 10. Nc2 Qd1 11. Nd4 Kg7 12. Rc2 Qe1+ 13. Kh3 Qh1+ 14. Kg3 Kh6
15. Kg4 Qh2 16. g3 Qh1 17. Kf4 f6 18. Ne2 Qd1 19. Nd4 a5 20. g4 b4 21. axb4
axb4 22. Kg3 Qe1+ 23. Kg2 Kh7 24. Kh3 Kg7 25. Re2 Qf1+
The whole line was interactively made with Houdini 5 and Brainfish against alone for White playing Brainfish.
Engines with less nullmove pruning seem to have advantages playing for Black, Houdini here was in Tactical Mode, the 0-1- game I showed in the other posting was SugaR, less nullmove pruning too.
Output after Backward of the line above and 4...h4 (?):
[d]8/pp3pk1/6p1/3p4/2pN3P/P1P2PK1/1P2R1P1/6q1 b - - 0 1
Analysis by Brainfish 190317 64 POPCNT:
4...a6 5.Re5 Qf1 6.Re7 b6 7.Re2 b5 8.Kf4 Kf6 9.Kg3 Qd1 10.Kg4 Qc1 11.Kh3 Qh1+ 12.Kg3 Qf1 13.Kg4 Qd1 14.h5 gxh5+ 15.Kxh5 a5 16.Kg4 b4 17.axb4 axb4 18.Rc2 Qe1 19.Re2 Qf1 20.Rc2 Kg6 21.Kg3 f5 22.Re2 Qc1 23.Rc2 Qe1+ 24.Kh3 f4 25.Kh2 Kf6 26.Re2 Qd1 27.g3 Qd3 28.Rc2 fxg3+ 29.Kxg3 Qg6+ 30.Kf2 Qh6 31.Kg3 Qg5+ 32.Kh3 Qg6 33.Rg2 Qh5+ 34.Kg3 Qg5+ 35.Kh3 Qh6+ 36.Kg4 Qc1 37.Rc2 Qd1 38.Re2 Qa1 39.Rc2 Qg1+ 40.Kh4 Qb1 41.Kh3 Qh1+ 42.Kg3 Kg6 43.Re2
-+ (-1.75) Depth: 55/80 00:03:04 4743MN, tb=6779238
And after one more ply backward:
[d]8/pp3pk1/6p1/3p4/2pN4/P1P2PKP/1P2R1P1/6q1 w - - 0 1
Analysis by Brainfish 190317 64 POPCNT:
4.Re7 b5 5.Re2 Qf1 6.Re5 a6 7.Re3 Qb1 8.Re2 Qc1 9.Kf2 Kf6 10.Rc2 Qd1 11.Re2 Qa1 12.Kg3 Qg1 13.Re8 Qf1 14.Re3 Kg7 15.Re7 Kf8 16.Re3 g5 17.Re2 a5 18.h4 gxh4+ 19.Kxh4 Kg7 20.Kg4 Kg6 21.Kf4 f6 22.g4 Qc1+ 23.Kg3 Qg1+ 24.Rg2 Qe1+ 25.Kh2 b4 26.Re2 Qc1 27.axb4 axb4 28.Rc2 Qf1 29.Kg3 Qg1+ 30.Kh3 Kg7 31.Nf5+ Kf8 32.Nd4 Qf1+ 33.Kh4 Kf7 34.Re2 Qc1 35.Rc2 Qe1+ 36.Kh3
-+ (-1.63) Depth: 51/68 00:06:24 9996MN, tb=7076799
And one more ply backward:
[d]8/pp3pk1/6p1/3p4/2pN4/P1P2P1P/1P2RKP1/2q5 w - - 0 1
Analysis by Brainfish 190317 64 POPCNT:
3.Rc2 Qb1 4.f4 Qd1 5.Re2 a5 6.g3 Qh1 7.h4 Qb1 8.Rd2 Kh6 9.Kg2 Qe4+ 10.Kh3 Qh1+ 11.Rh2 Qf1+ 12.Rg2 f5 13.Kh2 Qd1 14.Kh3 Qh1+ 15.Rh2 Qf1+ 16.Rg2 Kh5 17.Nb5 Qe1 18.Rh2 Qe3 19.Rg2 Qe4 20.Rh2 Qb1 21.Rg2 Qh1+ 22.Rh2 Qf3 23.Nd4 Qe3 24.Re2 Qd3 25.Rf2 Qe4 26.Rd2 Qh1+ 27.Rh2 Qd1 28.Rf2 Qa1 29.Rh2 Qf1+ 30.Rg2 Qe1 31.Re2 Qb1 32.Rg2 Kh6 33.Kh2 Qe4 34.Rd2 Qe3 35.Re2
-/+ (-1.56) Depth: 49/75 00:01:55 2979MN, tb=1557957
Peter.