MESON Chess Problem Database
Problem Display
PID: 188530 (4QRb1/3p3r/2P1Ppp1/Np2k3/4B1pq/B2K2b1/4R1N1/8 w - - 0 1)
Gurr, John
The Observer, 1937
(First published on Sun Sep 26 1937)
#2
10 + 10
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Rf7
- 2.exf7#
- 1...Bf7
- 2.exf7#
- 1...b4
- 2.Sc4#
- 1...f5
- 2.Bf3#
- 1...dxc6
- 2.Sxc6#
- 1...d5
- 2.Bxg6#
- 1...d6
- 2.Bb2#
- 1...Rf7
- Tries
- 1.Sb7?
- threat
- 2.Bb2#
- 2.Bd6#
- 1...Be1
- 2.Bd6#
- 1...Bf2
- 2.Bd6#
- 1...b4
- 2.Bb2#
- 1...d5
- 2.Bd6#
- 2.Bxg6#
- 1...d6
- 2.Bb2#
- 2.Bxd6#
- 1...Re7!
- threat
- 1.Qxd7?
- threat
- 2.Bb2#
- 2.Bd6#
- 2.Bxg6#
- 2.Qd5#
- 2.Qd6#
- 1...Bxe6
- 2.Bb2#
- 2.Bd6#
- 2.Bxg6#
- 2.Qd4#
- 2.Qd6#
- 1...Qg5
- 2.Bb2#
- 2.Bd6#
- 2.Qd5#
- 2.Qd6#
- 1...Qh6
- 2.Bb2#
- 2.Bd6#
- 2.Qd5#
- 2.Qd6#
- 1...Be1
- 2.Bd6#
- 2.Bxg6#
- 2.Qd5#
- 2.Qd6#
- 1...Bf2
- 2.Bd6#
- 2.Qd5#
- 2.Qd6#
- 1...Bf4
- 2.Bb2#
- 2.Bd6#
- 2.Qd5#
- 2.Qd6#
- 1...b4
- 2.Sc4#
- 2.Bb2#
- 2.Bxg6#
- 2.Qd5#
- 1...f5
- 2.Bb2#
- 2.Bd6#
- 2.Bf3#
- 2.Bd5#
- 2.Bxf5#
- 2.Qd5#
- 2.Qd6#
- 1...g5
- 2.Bb2#
- 2.Bd6#
- 2.Bg6#
- 2.Bxh7#
- 2.Qd5#
- 2.Qd6#
- 1...Rxd7+!
- threat
- 1.Qe7?
- threat
- 2.Bb2#
- 2.Bd6#
- 2.Qd6#
- 1...Be1
- 2.Bd6#
- 2.Qd6#
- 1...Bf2
- 2.Bd6#
- 2.Qd6#
- 1...b4
- 2.Sc4#
- 2.Bb2#
- 1...d5
- 2.Bd6#
- 2.Bxg6#
- 2.Qd6#
- 1...d6
- 2.Bb2#
- 2.Bxd6#
- 2.Qxd6#
- 1...Rxe7!
- threat
- 1.Qb8+?
- 1...d6
- 2.Qxd6#
- 1...Kxe6!
- 1...d6
- 1.exd7+?
- 1...Be6
- 2.Qb8#
- 1...Re7!
- 1...Be6
- 1.Sb7?
- Keys
- 1.Rf7!
- threat
- 2.exd7#
- 1...Rxf7
- 2.exf7#
- 1...Bxf7
- 2.exf7#
- 1...dxc6
- 2.Sxc6#
- 1...dxe6
- 2.Qb8#
- 1...b4
- 2.Sc4#
- 1...f5
- 2.Bf3#
- 1...d5
- 2.Bxg6#
- 1...d6
- 2.Bb2#
- threat
- 1.Rf7!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 1
- REMOVED MATES = 0
- Sets
- R(i);OGATE::QAR(I)+P(H),XR(i)
- B(j);OGATE::QAR(I)+P(H),XB(j)
- P(d);N_GUARD::S(F)
- P(f);::R(A)+B(E)
- P(h);XP(G)::S(F),XP(h)
- P(h);SBLOCK::R(A)+B(E),XP(g)
- P(h);SBLOCK::B(C)
- Tries
- Try
- S(F);
- Threat
- DUALS(2)
- Vars
- B(a);::B(C)
- P(d);::B(C)
- Refutation
- R(i);
- Try
- Q(I);XP(h)
- Threat
- DUALS(5)
- Refutation
- R(i);CHECK,XQ(I)
- Try
- Q(I);
- Threat
- DUALS(3)
- Refutation
- R(i);XQ(I)
- Try
- Q(I);CHECK
- Vars
- P(h);P_SPINP(h)::QAB1(I),XP(h)
- Refutation
- K(e);P-FLIGHT,XP(H)
- Try
- P(H);CHECK,XP(h)
- Vars
- B(j);P_SPINB(j),SBLOCK::QAB(I)
- Refutation
- R(i);P_SPINR(i)
- Try
- Actual
- R(J);
- Threat
- QAR(I)+P(H),XP(h)
- Vars
- R(i);OGATE,XR(J)::QAR(I)+P(H),XR(i)
- B(j);OGATE,XR(J)::QAR(I)+P(H),XB(j)
- P(h);XP(G)::S(F),XP(h)
- P(h);N_GUARD,P_SPINP(h),SBLOCK,XP(H)::QAB(I)
- P(d);N_GUARD::S(F)
- P(f);::R(A)+B(E)
- P(h);SBLOCK::R(A)+B(E),XP(g)
- P(h);SBLOCK::B(C)
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