MESON Chess Problem Database
Problem Display
PID: 196923 (8/2p4p/p1K3p1/p7/B2b2Q1/3kp3/2R5/4B3 w - - 0 1)
O'Keefe, John James
1st Prize, Australasian Chess Magazine, 1919-1920
#2
5 + 8
| 6490 | yacpdb | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Ba1
- 2.Qc4#
- 1...Bb2
- 2.Qc4#
- 1...Bc3
- 2.Rxc3#
- 1...Bc5
- 2.Rc3#
- 2.Qc4#
- 1...Be5
- 2.Qc4#
- 1...Bb6
- 2.Rc3#
- 2.Qc4#
- 1...Bf6
- 2.Qc4#
- 1...Ba7
- 2.Rc3#
- 2.Qc4#
- 1...Bg7
- 2.Qc4#
- 1...Bh8
- 2.Qc4#
- 1...e2
- 2.Qxe2#
- 1...g5
- 2.Qf5#
- 1...h5
- 2.Qxg6#
- 1...h6
- 2.Qxg6#
- 1...Ba1
- Tries
- 1.Kd5?
- threat
- 2.Qd1#
- 2.Qe2#
- 2.Qxd4#
- 2.Qe4#
- 1...e2
- 2.Qxe2#
- 2.Qxd4#
- 2.Qe4#
- 1...Ba1
- 2.Qd1#
- 2.Qe2#
- 2.Qc4#
- 2.Qe4#
- 1...Bb2
- 2.Qd1#
- 2.Qe2#
- 2.Qc4#
- 2.Qe4#
- 1...Bc3
- 2.Rxc3#
- 2.Qe2#
- 2.Qc4#
- 2.Qe4#
- 1...Bc5
- 2.Rc3#
- 2.Qd1#
- 2.Qe2#
- 2.Qc4#
- 2.Qe4#
- 1...Be5
- 2.Qd1#
- 2.Qe2#
- 2.Qc4#
- 2.Qe4#
- 1...Bb6
- 2.Rc3#
- 2.Qd1#
- 2.Qe2#
- 2.Qc4#
- 2.Qe4#
- 1...Bf6
- 2.Qd1#
- 2.Qe2#
- 2.Qc4#
- 2.Qe4#
- 1...Ba7
- 2.Rc3#
- 2.Qd1#
- 2.Qe2#
- 2.Qc4#
- 2.Qe4#
- 1...Bg7
- 2.Qd1#
- 2.Qe2#
- 2.Qc4#
- 2.Qe4#
- 1...Bh8
- 2.Qd1#
- 2.Qe2#
- 2.Qc4#
- 2.Qe4#
- 1...c5
- 2.Qd1#
- 2.Qe2#
- 2.Qe4#
- 1...c6+!
- threat
- 1.Bf2?
- 1...exf2
- 2.Qe2#
- 1...Ba1
- 2.Qc4#
- 1...Bb2
- 2.Qc4#
- 1...Bc5
- 2.Qc4#
- 1...Be5
- 2.Qc4#
- 1...Bb6
- 2.Qc4#
- 1...Bf6
- 2.Qc4#
- 1...Ba7
- 2.Qc4#
- 1...Bg7
- 2.Qc4#
- 1...Bh8
- 2.Qc4#
- 1...e2
- 2.Qxe2#
- 2.Qxd4#
- 1...g5
- 2.Qf5#
- 1...h5
- 2.Qxg6#
- 1...h6
- 2.Qxg6#
- 1...Bc3!
- 1...exf2
- 1.Bg3?
- 1...e2
- 2.Qxe2#
- 1...Ba1
- 2.Qc4#
- 1...Bb2
- 2.Qc4#
- 1...Bc5
- 2.Qc4#
- 1...Be5
- 2.Qc4#
- 1...Bb6
- 2.Qc4#
- 1...Bf6
- 2.Qc4#
- 1...Ba7
- 2.Qc4#
- 1...Bg7
- 2.Qc4#
- 1...Bh8
- 2.Qc4#
- 1...g5
- 2.Qf5#
- 1...h5
- 2.Qxg6#
- 1...h6
- 2.Qxg6#
- 1...Bc3!
- 1...e2
- 1.Bh4?
- 1...e2
- 2.Qxe2#
- 1...Ba1
- 2.Qc4#
- 1...Bb2
- 2.Qc4#
- 1...Bc5
- 2.Qc4#
- 1...Be5
- 2.Qc4#
- 1...Bb6
- 2.Qc4#
- 1...Bf6
- 2.Qc4#
- 1...Ba7
- 2.Qc4#
- 1...Bg7
- 2.Qc4#
- 1...Bh8
- 2.Qc4#
- 1...g5
- 2.Qf5#
- 1...h5
- 2.Qxg6#
- 1...h6
- 2.Qxg6#
- 1...Bc3!
- 1...e2
- 1.Bxa5?
- 1...e2
- 2.Qxe2#
- 1...Ba1
- 2.Qc4#
- 1...Bb2
- 2.Qc4#
- 1...Bc5
- 2.Qc4#
- 1...Be5
- 2.Qc4#
- 1...Bb6
- 2.Qc4#
- 1...Bf6
- 2.Qc4#
- 1...Ba7
- 2.Qc4#
- 1...Bg7
- 2.Qc4#
- 1...Bh8
- 2.Qc4#
- 1...g5
- 2.Qf5#
- 1...h5
- 2.Qxg6#
- 1...h6
- 2.Qxg6#
- 1...Bc3!
- 1...e2
- 1.Bb3?
- 1...e2
- 2.Qxe2#
- 1...Bc3
- 2.Rxc3#
- 2.Qc4#
- 1...Ba1
- 2.Qc4#
- 1...Bb2
- 2.Qc4#
- 1...Bc5
- 2.Rc3#
- 2.Qc4#
- 1...Be5
- 2.Qc4#
- 1...Bb6
- 2.Rc3#
- 2.Qc4#
- 1...Bf6
- 2.Qc4#
- 1...Ba7
- 2.Rc3#
- 2.Qc4#
- 1...Bg7
- 2.Qc4#
- 1...Bh8
- 2.Qc4#
- 1...g5
- 2.Qf5#
- 1...h5
- 2.Qxg6#
- 1...h6
- 2.Qxg6#
- 1...a4!
- 1...e2
- 1.Rd2+?
- 1...Kc3
- 2.Qxd4#
- 1...Kc4
- 2.Rxd4#
- 2.Qxd4#
- 1...exd2!
- 1...Kc3
- 1.Qe6?
- 1...Ba1
- 2.Qc4#
- 1...Bb2
- 2.Qc4#
- 1...Bc5
- 2.Qc4#
- 1...Be5
- 2.Qc4#
- 1...Bb6
- 2.Qc4#
- 1...Bf6
- 2.Qc4#
- 1...Ba7
- 2.Qc4#
- 1...Bg7
- 2.Qc4#
- 1...Bh8
- 2.Qc4#
- 1...g5
- 2.Qf5#
- 1...e2
- 2.Qxe2#
- 1...h5
- 2.Qxg6#
- 1...h6
- 2.Qxg6#
- 1...Bc3!
- 1...Ba1
- 1.Kd5?
- Keys
- 1.Rc4!
- threat
- 2.Rxd4#
- 1...Kxc4
- 2.Qe2#
- 1...e2
- 2.Qxd4#
- 1...Ba1
- 2.Bc2#
- 1...Bb2
- 2.Bc2#
- 1...Bc3
- 2.Rxc3#
- 1...Bc5
- 2.Bc2#
- 2.Rc3#
- 1...Be5
- 2.Bc2#
- 1...Bb6
- 2.Bc2#
- 2.Rc3#
- 1...Bf6
- 2.Bc2#
- 1...Ba7
- 2.Bc2#
- 2.Rc3#
- 1...Bg7
- 2.Bc2#
- 1...Bh8
- 2.Bc2#
- threat
- 1.Rc4!
FEATURES
- Static
- TYPE = BLOCK_THREAT
- CHANGED MATES = 7
- ADDED MATES = 1
- REMOVED MATES = 3
- Sets
- B(c);OGATE::QAB1(D)
- B(c);N_GUARD::R1(B),XB(c)
- P(b);::QAB1(D),XP(b)
- P(f);N_GUARD::QAB(D)
- P(h);N_GUARD::QAB(D),XP(f)
- Tries
- Try
- K(E);S_FLIGHT
- Threat
- DUALS(4)
- Refutation
- P(g);CHECK
- Try
- B(A);
- Vars
- P(b);XB(A)::QAB1(D)
- B(c);OGATE::QAB1(D)
- P(f);N_GUARD::QAB(D)
- P(h);N_GUARD::QAB(D),XP(f)
- Refutation
- B(c);
- Try
- B(A);
- Vars
- P(b);::QAB1(D),XP(b)
- B(c);OGATE::QAB1(D)
- P(f);N_GUARD::QAB(D)
- P(h);N_GUARD::QAB(D),XP(f)
- Refutation
- B(c);
- Try
- B(A);
- Vars
- P(b);::QAB1(D),XP(b)
- B(c);OGATE::QAB1(D)
- P(f);N_GUARD::QAB(D)
- P(h);N_GUARD::QAB(D),XP(f)
- Refutation
- B(c);
- Try
- B(A);XP(d)
- Vars
- P(b);::QAB1(D),XP(b)
- B(c);OGATE::QAB1(D)
- P(f);N_GUARD::QAB(D)
- P(h);N_GUARD::QAB(D),XP(f)
- Refutation
- B(c);
- Try
- B(C);
- Vars
- P(b);::QAB1(D),XP(b)
- B(c);OGATE::QAB1(D)
- P(f);N_GUARD::QAB(D)
- P(h);N_GUARD::QAB(D),XP(f)
- Refutation
- P(d);
- Try
- R(B);CHECK
- Vars
- K(a);P-FLIGHT::QAB1(D),XB(c)
- Refutation
- P(b);XR(B)
- Try
- Q(D);
- Vars
- B(c);::QAB1(D)
- P(f);N_GUARD::QAB(D)
- P(b);OGATE::QAB1(D),XP(b)
- P(h);N_GUARD::QAB(D),XP(f)
- Refutation
- B(c);
- Try
- Actual
- R(B);
- Threat
- R1(B),XB(c)
- Vars
- K(a);P_SPINB(c),S_FLIGHT,XR(B)::QAB(D)
- P(b);SBLOCK::QAR1(D),XB(c)
- B(c);::B(C)
- B(c);N_GUARD::R1(B),XB(c)
Developed and maintained by Brian Stephenson.
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