The following are board positions that might occur toward the
end of a game of Chessapawn. Actually, they were generated with
the help of Zillions. Solutions are given at the bottom of this
White to move and win in 4. It's time to mount an assault
on Black's connected Rooks.
Black to move and win in 3.
White was foolish enough to advance not just one, but both of
his Rooks, leaving most of his home row unguarded. It is nearly
impossible to build a successful defense against this many pieces without
the Rooks on their home rank.
White to move and win in 4.
Material is equal, and Black's more
highly-developed Pawns appear to have the upper hand, but
White has a surprise attack.
White to move and win in 4.
As in #2, you must break the Rook-pair defense.
Black to move and win in 7.
This one is pretty tough.
Answer: 1. Rook h1-h5. If Black takes the Rook,
advancing 2. Queen e6-e8 Rook a1xe8 3. Pawn f7xe8 wins.
Otherwise, 2. Rook h5xh8 Rook a8xh8 followed by
3. Queen e6-e8 Rook a8xe8 and
4. Pawn f7xe8 wins.
It's the Queen who will promote. But first:
Answer: 1. ... Rook a4xb4. This threatens
... Rook b4-b1, so White has to capture, paving
the way for Black's Queen. The moves are 2. Pawn a3xb4
Queen d6xb4 3. ... Queen b4-b1
Answer: 1. Bishop d2-h6. Black's Rook can't capture
because then 2. Bishop c4-g8 promotes. White 1 threatens
the followup 2. Bishop h6-g7 3. Bishop g7xh8 and
promotes. After White 1, Black has
no useful move. He replies, e.g. 1. ... Bishop e7-b4.
White continues 2. Bishop h6-g7 Rook h8-a8 3. Rook a1xa8
Again, Black has no useful move, and
4. Bishop g7-h8 wins.
Taking out a connected pair of rooks requires at least two pieces. The
first piece captures one rook while protected by the second piece, who
captures the second rook and promotes. More commonly, the attack will
consist of three pieces. The first piece will take out a rook and be
captured; then the second piece, protected by the third, can invade
anywhere on the final rank. The third will then promote.
Here, the Bishop is the first, the advanced Pawn is the second, and the
a1 Rook is the third.
White Bishop a6-b7 threatens to break up Black's Rooks,
and force the Rook on a1 behind the pawn. However, White's remaining
Rook is paralyzed: If it advances, ... Queen d2-d1 wins.
A direct assault on White's Rook is called for.
In this case, Black does well to break up his own rook pair. This is
normally a terrible move, but in this case the Rook's offensive power is
Answer: 1. ... Rook a8xa6.
The other Rook is sufficient to
prevent White's Queen from promoting for the moment, and White has
insufficient influence to attack it anytime soon. Black's move threatens
to capture the Pawn on d4, and then the paralyzed Rook. White replies
2. Pawn b2-b3 to protect against this attack. Black's
reply is 2. ... Queen d2xf2. Now White is suffering from
a serious move shortage. The g6 Pawn can't move; the a4 and b3 Pawns must
stay but to prevent an attack on the Rook; the Rook is paralyzed, and
the Queen can't move without being captured. So, White has to move the
g2 Pawn: 3. Pawn g2-g3. Any neutral move will do, e.g.
3. ... Rook a6-a5 4. Pawn g3-g4 Pawn h5-g4. White
has two unsavory moves which he must make in turn:
5. Pawn b3-b4 Rook a5xa4 6. Queen d7-d8 Rook h8xd8
7. Rook a1xa4 Queen f2-f1 promote.