MESON Chess Problem Database

Problem Display
PID: 200603 (1K3B2/pP2bPP1/RPqkP1p1/2NP4/1P2Q3/5r2/6B1/8 w - - 0 1)

Goulty, Allison Howard

The Observer, 1948

(First published on Sun Apr 18 1948)

1K3B2/pP2bPP1/RPqkP1p1/2NP4/1P2Q3/5r2/6B1/8

#2

13 + 6

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb7+
      • 2.Sxb7#
    • 1...Qe8+
      • 2.fxe8S#
    • 1...Qc7+
      • 2.bxc7#
    • 1...Qc8+
      • 2.bxc8S#
    • 1...Ra3
      • 2.Qf4#
    • 1...Rb3
      • 2.Qf4#
    • 1...Rc3
      • 2.Qf4#
    • 1...Rd3
      • 2.Qf4#
    • 1...Rg3
      • 2.Qf4#
    • 1...Rh3
      • 2.Qf4#
    • 1...Rf4
      • 2.Qxf4#
    • 1...Bxf8
      • 2.gxf8Q#
      • 2.gxf8B#
  • Tries
    • 1.Bxf3?
      • threat
        • 2.Qf4#
      • 1...Qxb7+
        • 2.Sxb7#
      • 1...Qe8+
        • 2.fxe8S#
      • 1...Qc7+
        • 2.bxc7#
      • 1...Qc8+
        • 2.bxc8S#
      • 1...Qxd5
        • 2.Qxd5#
      • 1...Bxf8
        • 2.gxf8Q#
        • 2.gxf8B#
      • 1...g5!
    • 1.Qf4+?
      • 1...Kxd5
        • 2.Bxf3#
      • 1...Rxf4!
    • 1.bxa7?
      • threat
        • 2.Rxc6#
      • 1...Bxf8
        • 2.gxf8Q#
        • 2.gxf8B#
      • 1...Qb6
        • 2.Rxb6#
      • 1...Qxa6!
  • Keys
    • 1.Qd4!
      • threat
        • 2.Se4#
      • 1...Qxb7+
        • 2.Sxb7#
      • 1...Qe8+
        • 2.fxe8S#
      • 1...Qc7+
        • 2.bxc7#
      • 1...Qc8+
        • 2.bxc8S#
      • 1...Qxd5
        • 2.bxa7#
      • 1...Qxc5
        • 2.bxc5#
      • 1...Bxf8
        • 2.gxf8Q#
        • 2.gxf8B#
      • 1...Re3
        • 2.dxc6#
      • 1...Rf4
        • 2.Qxf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • Q(b);CHECK,XP(I)::S(D),XQ(b)
    • Q(b);CHECK,OGATE::PXQ(b)=S
    • Q(b);CHECK,OGATE::R(F)+P(G),XQ(b)
    • R(a);N_GUARD::QAB(C)
    • R(a);N_GUARD::QAB(C),XR(a)
    • B(f);N_SPINB(f),OGATE,XB(M)::PXB(f)=Q
  • Tries
    • Try
      • B(A);XR(a)
      • Threat
        • QAB(C)
      • Vars
        • Q(b);CHECK,XP(I)::S(D),XQ(b)
        • Q(b);CHECK,OGATE::PXQ(b)=S
        • Q(b);CHECK,OGATE::R(F)+P(G),XQ(b)
        • Q(b);OGATE,XP(E)::QAR1(C),XQ(b)
        • B(f);N_SPINB(f),OGATE,XB(M)::PXB(f)=Q
      • Refutation
        • P(d);
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);N_SPINB(f),P-FLIGHT,P_SPINR(a),XP(E)::B(A),XR(a)
      • Refutation
        • R(a);XQ(C)
    • Try
      • P(G);P_PINQ(b),XP(e)
      • Threat
        • R1(F),XQ(b)
      • Vars
        • B(f);N_SPINB(f),OGATE,XB(M)::PXB(f)=Q
        • Q(b);OGATEB,P_PINP(I)::R(F),XQ(b)
      • Refutation
        • Q(b);N_SPINQ(b),XR(F)
  • Actual
    • Q(C);
    • Threat
      • S(D)
    • Vars
      • Q(b);CHECK,XP(I)::S(D),XQ(b)
      • Q(b);CHECK,OGATE::PXQ(b)=S
      • Q(b);CHECK,OGATE::R(F)+P(G),XQ(b)
      • Q(b);P_SPINQ(b),XP(E)::R(F)+P(G),XP(e)
      • Q(b);OGATE,XS(D)::P(B),XQ(b)
      • B(f);N_SPINB(f),OGATE,XB(M)::PXB(f)=Q
      • R(a);::QAR(C)+P(E),XQ(b)
      • R(a);N_GUARD::QAB(C),XR(a)
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