Supposedly a mate in 12

[Dann Corbit]

7r/p4k2/3p4/1p2p3/1P1n1p2/2B3qp/PK5R/1Q6 w - - bm Rd2;
I can't find it.

[jhellis3]

The correct answer is white is missing a piece.

[Deberger]

Levon Aronian vs Ding Liren, 2015

Black had mate in 11 after a few moves.

7r/p3k3/3p4/1p2p3/1P1B1p2/6q1/PKQR4/7q b - -

[Dann Corbit]

Yes, thanks, this move was from that game:
[d]7r/p4k2/3p4/1p2p3/1P1n1p2/2B3qp/PK5R/1Q6 w - - fmvn 52; hmvc 2; pm Rd2;
And a few moves later we have this:
[d]7r/p3k3/3p4/1p2p3/1P1B1p2/6q1/PKQR4/7q b - - acd 53; acs 8; bm Qge1; ce 32746; dm 11; pm Qge1; pv Qge1 Qc7+ Ke6 Be3 Qb1+ Ka3 Qhc1+ Qxc1 Qxc1+ Kb3 Rh3 Rd3 Qc4+ Kb2 fxe3 Rd2 exd2 a4 Qc1+ Ka2 Ra3+;

[Paloma]

7r/p4k2/3p4/1p2p3/1P1n1p2/2B3qp/PK5R/1Q6 w - - bm Rd2;
I can't find it.

Analysis by Stockfish 150220 64 BMI2:
52.Rd2 h2 53.Bxd4 h1Q 54.Qf5+ Ke7 55.Bxe5 Qa1+ 56.Kxa1 Qe1+ 57.Qb1 Qxe5+ 58.Rb2 Rh2 59.Qc1 Rxb2 60.Qxb2 f3 61.Kb1 Qxb2+ 62.Kxb2 f2 63.Kc2 f1Q 64.Kc3 Ke6 65.Kd4 Qf4+ 66.Kc3 Qe3+ 67.Kb2 Kd5 68.a3 Kc4 69.Ka2 Qe2+ 70.Ka1 Kc3 71.a4 Qb2#
-+ (-#20) Depth: 76/41 00:44:34 21486MN, tb=89901965

[MOBMAT]

Black-Diamond XI (corrected version) agrees

Code: Select all

Black-Diamond  XI:
-M20	
1.Qh1 Nf3 2.Rc2 h2 3.a4 Qg1 4.Rc1 Rg8 5.Qxf3 Qg2+ 6.Qxg2 Rxg2+ 7.Bd2 Rg1 8.Rc7+ Kg6 9.axb5 h1Q 10.Rc1 Rxc1 
11.Bxc1 f3 12.Be3 Qe1 13.Bxa7 Qxb4+ 14.Kc2 Qa4+ 15.Kc1 Qxa7 16.Kb2 f2 17.b6 Qxb6+ 18.Kc2 f1Q 19.Kc3 Qc1+ 20.Kd3 Qbe3+

But there appears to be another first move...
Researching for multiple solutions..

[MikeB]

Black-Diamond XI (corrected version) agrees

Code: Select all

Black-Diamond  XI:
-M20	
1.Qh1 Nf3 2.Rc2 h2 3.a4 Qg1 4.Rc1 Rg8 5.Qxf3 Qg2+ 6.Qxg2 Rxg2+ 7.Bd2 Rg1 8.Rc7+ Kg6 9.axb5 h1Q 10.Rc1 Rxc1 
11.Bxc1 f3 12.Be3 Qe1 13.Bxa7 Qxb4+ 14.Kc2 Qa4+ 15.Kc1 Qxa7 16.Kb2 f2 17.b6 Qxb6+ 18.Kc2 f1Q 19.Kc3 Qc1+ 20.Kd3 Qbe3+

But there appears to be another first move...
Researching for multiple solutions..

current BD-030120

added some new keyboard shortcuts - I made these for myself, but some might appreciate them , not many I suppose...you also use the word set and you can spell out the option if you desire ( works with any option that does not have 'spaces' in the name
s t 64 == setoption name threads value 64
s z c:/syzygy == setoption name syzygypath value c:/syzygy
s h 32768 == setoption name hash value 32768

existing shortcuts:
p f == position fen
d == displays the position
b == bench
g == go
i == infinite
q == quit
? == stop

MichaelB7@VM-894787 MINGW64 /c/cluster.mfb/Popcnt-LP
# Black-diamond-030120
Black Diamond 030120 by T. Romstad, M. Costalba, J. Kiiski, G. Linscott
info string Hash LargePages 256 Mb
s t 64
Confirmation: Threads set to 64
s z c:/syzygy
info string Found 510 tablebases
Confirmation: SyzygyPath set to c:/syzygy
s h 32768
info string Hash LargePages 32768 Mb
Confirmation: Hash set to 32768
p f 7r/p4k2/3p4/1p2p3/1P1n1p2/2B3qp/PK5R/1Q6 w - -

current BD:

info depth 46 seldepth 42 multipv 1 score mate -20 nodes 68269640417 nps 120505962 hashfull 1000 tbhits 372926069 time 566525 pv b1h1 d4f3 h2c2 h3h2 c2c1 g3f2 c1c2 f2g1 c2c1 g1h1 c1h1 h8g8 b2c2 g8g1 h1h2 f3h2 c3d2 h2f3 d2c3 f3d4 c2d2 g1g2 d2d1 f4f3 c3e1 f3f2 e1f2 g2f2 d1e1 f2a2 e1f1 a2c2 f1e1 e5e4 e1f1 e4e3 f1g1 d4f3 g1f1 c2f2