7 steps to heaven. 7 testpositions of variable difficulty!

[George Tsavdaris]

..

And since i see you like nice studies here is a fun one.
White to play and win with 1.Bg2! (and not Kxg1? that draws) with the nice little trip of the King: Ke2->e3->d4->e5->f5->g6->f7->g7->g6->f5->e5->d4->e3->e2->f1 1-0

Otto Blathy.
[d]qrb5/rk1p4/p2P4/Pp6/1N2n3/5Bp1/5n2/5Kb1 w - - 0 1

[peter]

It's a result of the original study i gave with the 1...Rxh1 that (as i've said earlier) i don't know its origin:

I had realized the latter position was the ending of the study we had discussed before, George, and sorry, I missed you had already told us, you wouldn't be informed about its origin, that's a pity, I'd really like to know the author,

[peter]

That's a nice one too, but not so difficult for Stockfish:

Code: Select all

qrb5/rk1p4/p2P4/Pp6/1N2n3/5Bp1/5n2/5Kb1 w - - 0 1

Analysis by Stockfish 2.3.1 JA 64bit SSE4.2:

1.Kxg1 Sh3+ 2.Kf1 g2+ 3.Lxg2 Shf2 4.Sd3 Kc6 5.Sxf2 Kxd6 6.Lxe4 
  -+  (-23.67)   Tiefe: 7/12   00:00:00  3kN
1.Kxg1 Sh3+ 2.Kf1 g2+ 3.Lxg2 Shf2 4.Kg1 Sh3+ 5.Kf1 
  =  (0.00)   Tiefe: 8/17   00:00:00  5kN
...
1.Kxg1 Sh3+ 2.Kf1 Shg5 3.Lg2 Sf3 4.Lxf3 g2+ 5.Lxg2 
  =  (0.00)   Tiefe: 52/17   00:00:03  22001kN
1.Lg2 Lh2 2.Ke2 Lg1 3.Ke3 Lh2 4.Kd4 Lg1 5.Ke5 Lh2 6.Kf5 Lg1 7.Kg6 Lh2 8.Kg7 Lg1 9.Kh7 Lh2 10.Kg6 Lg1 11.Kf5 Lh2 12.Ke5 Lg1 13.Kd4 Lh2 14.Ke3 Sd1+ 15.Kxe4 Lg1 16.Ke5# 
  +-  (#21 ++)   Tiefe: 53/32   00:00:04  28348kN

Main variant is a bit too short, but after 14....Bg1 instead of Nd1+, 21 moves to mate might be rather correct, it seems

[lech]

Sting-sf-3 (beta) gets this position, without ugly pawns h7 and f7 (only time consuming) on my dualcore in two minutes.
5K2/k7/5p1p/1p3p2/bP6/1p6/1P5p/7B w - - 0 1 bm Ke8(e7);

Pawn on f7 is critical in order to entice computer to capture it.
[d]5K2/k4p1p/8/1p3p2/bP6/1p6/1P5p/7B w - - 0 1

Pawn f7 is no problem (time 3 minutes).
Sting-sf-3 beta; 2 threads; 1056M hash
[d]5K2/k4p1p/8/1p3p2/bP6/1p6/1P5p/7B w - - 0 1 bm Ke8(e7);

Code: Select all

info depth 43
info currmove f8f7 currmovenumber 1
info nodes 163577926 nps 1394740 time 117282
info currmove h1f3 currmovenumber 2
info nodes 167693273 nps 1394167 time 120282
info currmove f8g7 currmovenumber 3
info nodes 174263581 nps 1391670 time 125219
info currmove h1d5 currmovenumber 4
info currmove h1e4 currmovenumber 5
info currmove f8e7 currmovenumber 6
info nodes 176638088 nps 1388456 time 127219
info currmove h1c6 currmovenumber 7
info currmove h1g2 currmovenumber 8
info nodes 177480754 nps 1387750 time 127891
info currmove f8e8 currmovenumber 9
info currmove h1b7 currmovenumber 10
info currmove f8g8 currmovenumber 11
info currmove h1a8 currmovenumber 12
info depth 43 seldepth 48 multipv 1 score cp 0 nodes 178037024 nps 1387359 time
128328 pv f8f7 a7b6 f7e6 b6c7 e6f5 c7d7 h1e4 h7h6 f5f6 d7c8 e4h1 c8d8 h1g2 d8c7
g2e4 h6h5 e4f3 c7c8 f3h1 c8d7 h1f3 d7d8 f6e6 d8c8 e6f6 c8d8
info depth 44
info currmove f8f7 currmovenumber 1
info nodes 228749674 nps 1422324 time 160828
info currmove f8e7 currmovenumber 2
info depth 44 seldepth 0 multipv 1 score cp 8 lowerbound nodes 264359182 nps 141
1798 time 187250 pv f8e7 a7b6 e7d7 f5f4 h1d5 b6a6 d7c7 a6a7 d5b7 f7f5 b7g2 a7a6
g2h1 a6a7 h1b7 f4f3 b7f3 a7a6 f3c6 a6a7 c6b7 f5f4 b7g2 a7a6 g2d5 a6a7 d5g2
info nodes 264359182 nps 1411798 time 187250
info currmove f8e7 currmovenumber 1
info depth 44 seldepth 0 multipv 1 score cp 16 lowerbound nodes 266185644 nps 14
08389 time 189000 pv f8e7 a7b6 e7d7 h7h5 h1f3 b6a7 d7c7 h5h4 f3b7 f5f4 b7h1 a7a6
 h1e4 h4h3 e4b7 a6a7 b7f3 a7a6 c7d7 a6a7 d7c7
info nodes 266185644 nps 1408389 time 189000
info currmove f8e7 currmovenumber 1
info depth 44 seldepth 0 multipv 1 score cp 28 lowerbound nodes 266847697 nps 14
07120 time 189641 pv f8e7 f5f4 e7d7 a7b8 h1c6 f7f6 c6d5 h7h6 d5h1 b8a7 d7c7 a7a6
 h1b7 a6a7 c7c8 a7b6 c8b8 f6f5 b8c8 b6a7 c8c7 h2h1n b7h1 a7a6 c7b8 a6b6 h1d5 h6h
5 d5b7 h5h4 b7h1 h4h3 b8c8 h3h2 c8d7 b6a7 d7c7 a7a6 h1f3 a6a7 f3b7 h2h1n b7h1 a7
a6 h1g2 a6a7 g2f3 a7a6 f3h1 a6a7 h1g2 f4f3 g2f3 a7a6 f3h1 a6a7 h1b7 f5f4 b7f3 a7
a6 f3d5
info nodes 266847697 nps 1407001 time 189657
info currmove f8e7 currmovenumber 1
info depth 44 seldepth 0 multipv 1 score cp 46 lowerbound nodes 268339100 nps 14
05027 time 190985 pv f8e7 f5f4 e7d7 h7h5 d7c8 h5h4 c8c7 a7a6 h1g2 h4h3 g2b7 a6a7
 b7f3 a7a6 f3h1 a6a7 h1b7 h2h1n b7h1 a7a6 h1f3 h3h2 f3b7 a6a7 b7e4 a7a6 c7b8 h2h
1b e4h1 a6b6 h1b7 f4f3 b7f3 b6a6 b8c8
info nodes 268339100 nps 1405027 time 190985
info currmove f8e7 currmovenumber 1
info depth 44 seldepth 0 multipv 1 score cp 74 lowerbound nodes 269247468 nps 14
03470 time 191844 pv f8e7 a7b8 e7d7 b8a7 h1d5 a7b8 d5f3 b8a7 d7c7 h7h6 f3h1 a7a6
 h1b7 a6a7 b7f3 a7a6 f3h1 a6a7 h1b7 h2h1n b7h1 f7f6 h1b7 h6h5 b7f3 h5h4 f3b7 h4h
3 b7f3 h3h2 f3b7 h2h1n b7h1 a7a6 c7d7 a6b6 d7e6 b6c7 e6f5 c7d6 f5f6
info nodes 269247468 nps 1403353 time 191860
info currmove f8e7 currmovenumber 1
info depth 44 seldepth 0 multipv 1 score cp 114 lowerbound nodes 272006580 nps 1
399952 time 194297 pv f8e7 a7b8 e7d7 f5f4 h1c6 b8a7 d7c7 f7f6 c6d5 a7a6 d5b7 a6a
7 b7c6 a7a6 c6f3 f6f5 f3b7 a6a7 b7h1 a7a6 h1b7
info nodes 272006580 nps 1399952 time 194297
info currmove f8e7 currmovenumber 1
info nodes 302850916 nps 1363904 time 222047
info currmove f8f7 currmovenumber 2
info currmove h1d5 currmovenumber 3
info nodes 303523864 nps 1363674 time 222578
info currmove h1f3 currmovenumber 4
info currmove h1b7 currmovenumber 5
info currmove h1c6 currmovenumber 6
info nodes 304579952 nps 1363151 time 223438
info currmove h1g2 currmovenumber 7
info currmove h1e4 currmovenumber 8
info currmove f8g7 currmovenumber 9
info currmove f8g8 currmovenumber 10
info currmove h1a8 currmovenumber 11
info currmove f8e8 currmovenumber 12
info depth 44 seldepth 62 multipv 1 score cp 161 nodes 305554072 nps 1362462 tim
e 224266 pv f8e7 a7b8 e7d7 f5f4 h1c6 b8a7 d7c7 f7f6 c6d5 a7a6 c7b8 a6b6 d5b7 f6f
5 b7a8 b6a6 a8g2 f4f3 g2f3 a6b6 f3b7 f5f4 b7f3 b6a6 f3a8 a6b6 a8b7 h2h1n b7h1 b6
a6 b8c7 a6a7 h1f3 a7a6 f3d5 a6a7 d5b7 f4f3 b7f3 a7a6 f3e4 h7h6 e4h1 a6a7 h1b7 h6
h5 b7h1 a7a6 h1b7 a6a7