+ Training (English)

How to break the fortress of the black? 

Another position that underlines some engines limits.
Do your engines find the n.48, 51 and 53 White moves?

Simagin,Vladimir - Janssen,K wchsf cr, 1967
8/2k5/5p1b/p1pBpP1P/2P5/1PK2P2/P7/8 w - - 0 48

  According to the rules, a road for the king to the h5-pawn should be paved, but how does one do so? The breakthrough a2-a3 and b3-b4 (followed with c4-c5) should be carried out when the king is on d3. The bishop belongs on a4 where it deprives the black king of important squares and holds Black's eventual passed b-pawn that soon appears.
48.Bf7!
[The straightforward attempt 48.Kb2 Kb6 49.Ka3 Bg5 50.Ka4 Bh6 51.a3 Bg5 52.b4 axb4 53.axb4 cxb4 54.Kxb4 allows Black to build an unassailable fortress by means of 54...Bd2+! 55.Kb3 Kc5=]
48...Bf8
[ If 48...Kd6 49.Be8 Ke7 50.Ba4 Kf7 51.a3 Bf8 52.Kd3 Kg7 53.Ke4+-;
 48...Kd7 49.a3 Kc6 50.Be8+ Kb6 51.Ba4 Bf8 52.Kd3 Kc7 53.b4 cxb4 54.axb4 axb4 55.c5 Bxc5 56.Kc4+-]
49.Be8 Bh6 50.a3 /\ b4 50...Bf8
[If 50...Kb6 then 51.Kd3 /\ Ke4-d5 51...Kc7 52.b4! axb4 53.axb4 cxb4 54.c5 b3 (54...Bf8 55.Kc4 b3 56.Ba4 b2 57.Bc2+-) 55.Kc3 (Or 55.Ba4 b2 56.Bc2+-) 55...Bf8 56.c6+-]
51.Ba4! Kb6
[51...Bh6 52.b4; 51...Kd6 52.b4 is decisive in both cases.]
52.Kd3 /\ Ke4-d5 52...Kc7

5b2/2k5/5p2/p1p1pP1P/B1P5/PP1K1P2/8/8 w - - 0 53

53.b4!

53...axb4 54.axb4 cxb4 55.c5! 1-0 Simagin

[Black resigned due to 55.c5 Bxc5 (55...b3 56.Kc4 b2 57.Bc2+-) 56.Kc4 Bf8 (56...Kd6 57.h6) 57.Kd5 Kd8 58.Ke6+-]  1–0

Do your engines find the n.48, 51 and 53 White moves?

//      //     //     //      //     //      //     //     //      //

Study - pawn break and deviation.

I wanted to create a study that put the engines in difficulty, to highlight the limits.
The position develops the themes of pawn break and deviation:

8/pB2kb2/2K1p3/7p/3Pp1p1/2P3P1/2P2P2/8 b - - 0 0

1. ..h4
break pawn, to create the passed pawn e3.
2..gxh4 g3 [The engines play: 2. ..Bh5?! 3.Ba6 Kf6=] 3.fxg3 e3 4.Ba6:

8/p3kb2/B1K1p3/8/3P3P/2P1p1P1/2P5/8 b - - 0 4

4. ..Ae8+!
The "deviation". You have to move the White Bishop from the a6 key, to liberate the 'a' pawn.[Even here, the engines insist with Bh5: 4. ..Bh5?! 5.Kb7 e2 6.Bxe2 Bxe2 7.Kxa7=]
5.Kb7 Bb5! 6.Bxb5 a5 7.h5 a4 0-1.  The Bishop can not stop both passed pawns 'a' and 'e'.
Notice how the engines on the second and fourth move, are limited to consider the draw move Bh5.

//    //    //    //    //   //   //   //   //   //

Training - Light pieces endgames.

Training2 - Light pieces endgames.

This database contains ten endgames played among GM.
It are all light pieces endgames (Knight, Bishop + pawns).
The games are instructive examples of as to treat these positions.
I have select these games because it develop themes and typical strategies used by the GM when they plays these endgames types.
For the databse installation to follow the procedure explained for the game Fischer-Taimanov:page


Download: Training2