In
the previous game we saw a classic example of the double B sacrifice
and learned what it took to make it work. Remember, these are the
conditions we are looking for:
1)
One Rook must be immediately available
2)
The victims pieces must be unable to support the defense
3)
The K cannot escape via the f-files
4)
Refusal of the second B sacrifice must have serious disadvantages
5)
Material at the end of the combination must be favorable to the side
making the sacrifices.
Benjamin |
In this game it didn't quite work for Joel Benjamin. I think the
reason why it didn't was because he decided to check the black K with
his R on the g-file instead of the h-file. This resulted in black
being able to exchange his Q for the R on g3 which blocked Benjamin's
other R from being quickly brought into play long the third rank
which was, after ...Qxg3, obstructed by a Pawn.
Bartholomew |
That said, it appears from the Shootouts that even had he played to
deliver the R-check on the h-file, then point 5 comes into play. The
material was, theoretically, favorable to him, but the balance was so
delicate that the remainder of the game wold have been very difficult
to play correctly.
Note:
In several instances I used the Fritz Shootout analysis mode, so
perhaps for those that are unfamiliar with this, I should briefly
explain how it works. Starting from any position it is a way to get
the engine to play against itself.
You can play the games using either blitz or long time controls or by
using a third method, fixed depth which is the one I used. You set
the number of ply the engine is to look ahead; I used 11 ply (5.5
moves) and the engine will then calculate moves out to 11 ply search
depth, then make that move. Then it will calculate a reply for the
other side to 11 ply and make the move.
There is also a second ply setting; I used 19 ply (9.5 moves). What
this means is in the first game, moves will be made after a 7-ply
search. In the second game the engine will move after a 9-ply search,
and so on until it finally makes its move after a 19-ply search. Thus
a series of five games were played starting from the position with
each successive game using a deeper search. When using this function
even numbered plies are skipped because some older engines exhibit a
form of tactical blindness at searches which are cut off after an
even number of plies.
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