"Easy for Humans" Test Position...

[Howard E]

Thanks for the position. i7-920 256 mb hash

ProDeo Hera:
13 00:00 2.133.212 2.133.212 +2.24 Bf7 Kf6 Kxb4 Rb7+ Ka4 Ra7+ Kb5 Rb7+ Kc5 Rc7+ Kd5 Rd7+ Kc4 Rc7+ Kd3 Rc4 bxc4
14 00:01 4.999.737 4.999.737 +2.30 Bf7 Kf6 Kxb4 Re4+ Kc5 Ne6+ Bxe6 Rxe6 Rc7 Re5+ Kd4 Rg5 g7 Ke6 Kc4 Rg4+ Kb5 Rg1 Kc4 Rc1+ Kd4 Rg1 Kc4 Rc1+
15 00:04 14.808.013 3.091.443 +2.29 Bf7 Kf6 Kxb4 Re5 Kc4 Nh5 b4
16 00:10 33.375.801 3.337.580 +2.25 Bf7 Kf6 Kxb4 Re5 Kc4 Re7 b4 Re4+ Kc5 Re5+ Kb6 Ne6 Rh1 Kg7
17 00:23 76.799.855 3.339.124 +2.22 Bf7 Kf6 Kxb4 Ne6 Rh1 Rb7+ Kc4 Ng5 Rf1+ Kg7 Rf4 Rc7+ Kd5 Rc2 Rf5 Rd2+ Kc4 Rc2+ Kd4 Rd2+ Kc4 Rc2+ Kd4 Rd2+
18 00:47 156.446.243 3.328.643 +2.17 Bf7 Kf6 Kxb4 Ra7 Rh6 Ke5 Rh7 Kf6 Rh6 Ke5 Rh7
18 00:51 173.305.098 3.398.139 +2.17 Rxg7
18 00:56 191.268.007 3.415.500 +2.17 Rxg7
18 00:59 202.093.645 3.425.316 +4.38 Rxg7 Rxg7 Bf7 Ke5 Kxb4 Kd6 Kc4 Kc6 Be8+ Kd6 Kd4 Ke7 Bf7 Kd6 Kc4 Kc6 Be8+ Kd6 Kd4 Ke7 Bf7 Kd6
19 01:03 216.976.855 3.444.077 +4.44 Rxg7 Rxg7 Bf7 Ke5 Kxb4 Kd6 Kc4 Kc6 Kd4 Kd6 Bc4 Rxg6 Kc3 Kd7 b4 Ke7 Kd3 Kd7 Kd4 Ke7 Bb3 Rd6+ Kc4 Rh6
20 01:11 253.770.074 3.574.226 +4.42 Rxg7 Rxg7 Bf7 Ke5 Kxb4 Kd6 Kc4 Kc6 b4 Kd6 b5 Kd7 Kd5 Kc7 Kc4 Kb6 Bd5 Rxg6 Be6 Rxe6 Kd5 Kxb5 Kxe6
21 01:35 347.044.918 3.653.104 +4.58 Rxg7 Rxg7 Bf7 Ke5 Kc5 Kf5 Kxb4 Kf6 Kc4 Ke7 Kd5 Kd7 Ke5 Kc6 Kf6 Rxg6+ Bxg6 Kb5 Bd3+ Kc5 Bc4 Kb4 Ke5 Ka3

[tano-urayoan]

I already posted this position here: http://www.talkchess.com/forum/viewtopic.php?t=31267

[parrish]

This is a great test postion THANKS and most of my engines have real difficulty but...

64 bit winfinder finds it in 46 secs

Winfinder will find immediately if you set PV=2 or more
The same about Deep Fritz 8
And Dynamic 1-cpu...

Toga II 1.2.1 also finds it almost immediately with PV=2.

[Cubeman]

The big question is if 1.Bf7 also wins?Which leads to a 2 pawn advantage.
I agree that the fastest method seems to be 1.Rxg7 but some engines may prefer the slow way.

[parrish]

The big question is if 1.Bf7 also wins?Which leads to a 2 pawn advantage.
I agree that the fastest method seems to be 1.Rxg7 but some engines may prefer the slow way.

Rxg7 is the obvious guaranteed win. Bf7 gives an advantage, but your own question suggests it may not be a guaranteed win; so why play the slower way that isn't a guaranteed win?