Black to move and win. How should Black proceed?
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1 .. Bxc2+ looks good, for example 2 Kxc2 Qb3+ 3 Kc1 Nxd4 4 cxd4 Qxf3 wins.
1..Bxc2+ 2.Kxc2 Qb3+ 3.Kc1 Nb4
1…Bxc2+ 2.Kxc2 Qb3+ 3.Kc1 Nb4 winning
1. …, Bxc2+
2. Kxc2, Qb3+
3. Kc1, Nxd4
and white takes queen
e5!
1. … Bxc2+
If white takes he/she loses immediately:
2. Kxc2 Qb3+
3. Kc1 Nb4
4. cxb4 (only way to prevent mate) Qxf3
So instead:
2. Ke2 Nxd4+
3. cxd4 c3+
4. Ke3 Qd3+
5. Kf4 Qxd4+
6. Kg5 cxd2
Threatening dxe1 or d1=Q, but if the rook leaves the e-file it’s also unpleasent for white, e.g.
7. Rd1 Qe5+
8. Bf5 Bxf5
Threatening Bh3+ with mate to follow, so white has to exchange queens:
9. Qf4 Qxf4
10. gxf4 with Rxd2 to follow.
Not a bad deal for black, not to mention white’s position is horrible.
I have to admit I’m not sure if that line is correct after move 4.
But:
5. Kf4 Qxf3
6. Kxf3 cxd2
should be good enough for black, too.
1…Bxc2! 2.KxBc2 Qb3+ 3.Kc1 Nb4 0-1
1 … Bxc2+!
2 Kxc2 Qb3+
3 Kd1 Nb4!
Threating Qc2# or Nd3# (if Qd1). White has to give up his Queen.
Also,
1 … Bxc2+
2 Ke2 Nxd4+!
3 cxd4 c3+
One possibility might be
1. …..Bc2
2. Kc2 Qb3
3. Kc1 Nd4?
4. Qd1 and I don’t see a good continuation for black- there are no good squares for the knight; however, the less materialistic
3. …..Nb4!
4. Qd1 Nd3# seems to win.
Also, I would add that
1. …..Bc2
2. Ke2 Nd4
3. cd4 c3
4. Ke3 Qd3
5. Kf4 Qf3
6. Kf3 cd2 wins an exchange and two pawns, at the very least, and I may have overlooked a mate on the white king in the middle of the board.
1… Bxc2+!
2. kxc2 qb3+
3. kc1 Nb4! with no good way to stop checkmate or loss of material (cxb4 qxf3)
I think:
1… Bxc2+
2. Kxc2 Qb3+
3. Kc1 Nxd4
… wins the queen or mates with Qc2.
Brad H.
Bxc2!-+ If Kxc2, Qb3, Kc1 Nb4 cxb4 (Qd1 Nd3#) Qxf3
…Bxc2+
Kxc2 Qb3+
Kc1 Nb4!
0-1
1. … Bxc2+
2. Kxc2 Qb3+ *
3. Kc1 Nxd4
4. Qd1
(4. cxd4, Qxf3)
4. … QxQ
5. KxQ Nb3
6. Ra-any d4
7. Kc2
now, 7… d3
or 7… Nxd2 8. Kxd2 dxc3+ with three q-side passed pawns
or 7… Rd7 with the idea of doubling on the d-file
all give black good compensation for the material.
* or if
2. Ke2 Nxd4+
3. cxd4 c3+
4. Qe3 Qd3+
5. Kf4 cxd2
and black is winning
black plays bxce and qb3+ followed by nxd4
I think it is:
. Bxc2+
Kxc2 Qb3+
Kc1 Nb4
if cxb then the white queen falls otherwise it’s checkmate.
1. Bxc2+ 2. Kxc2, Qb3+
3. Kc1 Nxd5! +-
Black wins since the knight cannot be taken because of Qxf3, and meanwhile the knight threatens both the Queen and a checkmate on c2.
One idea (not verified yet)
1…Bxc2+ 2. Kxc2 Qb3+ 3. Kc1 4. Nb4 (threatening 5. Qc2#) cxb4 5. Qxf3
1…Bxc2+ 2. Kc1 or Ke2 then maybe 3. Bd3 with a good game
1… Bxc2+
2 Kxc2 Qb3+
3 Kc1 Nxd4 & either wins Q or else 4 …Nb3#
1. … Bxc2+
if 2. Kxc2 then Q-b3+,
3. K-c1 and Nxd4+ attacks the white Q and threatens mate on c2; White cannot take the N because that leaves the Q unguarded.
if 2. K-c1 then B-d3 threatens Q-b3;
so 3. B-f1, and B-f5 wins material
Actually, it seems that
1. … Bxc2
2. Kc1! Qb3
3. Re3 Bd3
4. Qd1 Na5
white is under pressure, but temporarily safe. Any attempt to free the white king will result in material loss, though, for example
5. Qxb3 Nxb3+ followed by Nxa1 or Nxd2
So black has a lot of time to prepare the further attack.