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Old August 11th 04, 10:23 AM
Dana Turnmire
 
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Default Checkmate with Knight and Bishop

The easiest method for this mate I have found is in the "Mammouth Book of Chess."

W-manoeuvre

A W-shaped knight manoeuvre that is
needed to force mate with bishop and
knight versus a bare king. Since mate
can only be forced near a corner
square that can be attacked by the
bishop, the defender will aim, when
forced to the edge of the board, for a
safe corner. Then the W-manoeuvre is
the way to drive the king to a corner
where it can be mated.

-- -- -- -- -- BK -- --
-- -- -- -- -- WN -- --
-- -- -- -- -- WK -- --
-- -- -- -- -- -- -- --
-- -- -- -- -- -- -- --
-- -- -- WB -- -- -- --
-- -- -- -- -- -- -- --
-- -- -- -- -- -- -- --
The black king has just been checked
out of the safe corner.
1 Bh7
Preventing the king returning to g8.
1...Ke8 2Ne5
The first step of the W. The knight is
headed for d7, where it will stop the
king getting back to f8. The point of
the W-manoeuvre is not the shape it-
self, but rather that the knight must
cover key squares the bishop cannot
reach, i.e. h8, f8, d8, c5 and b6, as the
king is driven across to a8. The W en-
ables the knight to cover these squares
in quick enough succession.

2..Kf8
2...Kd8 3 Ke6 Kc7 4 Kd7! (the next
step of the W covers all the right
squares) 4...Kc6 5 Bd3 just traps the
king in the "right" corner.
3 Ke6 Ke8 4 Nd7 Kd8 5 Kd6
The king covers any possible escape
squares on the second rank.
5...Ke8 6 Bg6+
Ejecting the king from e8, and neatly
covering f7, which the white king no
longer guards.
6...Kd8 7Nc5
Setting off to cover d8, now that e8 is
sealed off.
7...Kc8 8 Bf7
Simply losing a move, while keeping
the bishop covering e8.
8...Kd8 9 Nb7+
-- -- -- BK -- -- -- --
-- WN -- -- -- WB -- --
-- -- -- WK -- -- -- --
-- -- -- -- -- -- -- --
-- -- -- -- -- -- -- --
-- -- -- -- -- -- -- --
-- -- -- -- -- -- -- --
-- -- -- -- -- -- -- --

9...Kc8 10 Kc6 Kb8 11 Kb6
Again the king prevents his opposite
number reaching the second rank.
11 Kc8 12 Be6+
And again the bishop drives back the
king.
12...Kb8
Now White can relax a little. The
king and bishop confine the black
king to two squares, and it's just a
case of manoeuvring the knight in
such a way as to give checkmate,
rather than stalemate!
13 Bf5
Just losing a move, so that when the
knight arrives on a6, it will be with
check. Any sensible square on the h3-
c8 diagonal would do just as well.
13...Ka8 14 Nc5 Kb8 15 Na6+ Ka8
16Be4#
If you understand this manoeuvre,
mating with bishop and knight is rou-
tine. Without knowing this manoeu-
vre, it can be an extremely difficult
ending to finish off. To extend a little
chess rhyme (referring to how various
pieces cooperate together):
Queen and knight, they 're all right;
Rook and knight, not too bright;
Bishop and knight, takes all night!
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