MESON Chess Problem Database

Problem Display
PID: 217857 (BNk5/6Pb/pB2pr2/K1n1R3/p1Q1p3/1p1p4/8/6b1 w - - 0 1)

Livingston, J

British Chess Magazine, 1920

BNk5/6Pb/pB2pr2/K1n1R3/p1Q1p3/1p1p4/8/6b1

#2

7 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Rf8
      • 2.gxf8Q#
      • 2.gxf8R#
  • Tries
    • 1.Rxc5+?
      • 1...Kxb8
        • 2.Rc8#
      • 1...Bxc5!
    • 1.Rd5?
      • threat
        • 2.Rd8#
      • 1...Kxb8
        • 2.Rd8#
      • 1...Rf8
        • 2.gxf8Q#
        • 2.gxf8R#
      • 1...exd5!
    • 1.g8Q+?
      • 1...Rf8
        • 2.Qxf8#
      • 1...Bxg8!
    • 1.g8R+?
      • 1...Rf8
        • 2.Rxf8#
      • 1...Bxg8!
  • Keys
    • 1.Qd5!
      • threat
        • 2.Qd8#
      • 1...Sb7+
        • 2.Qxb7#
      • 1...Kxb8
        • 2.Qd8#
      • 1...exd5
        • 2.Re8#
      • 1...Rf8
        • 2.gxf8Q#
        • 2.gxf8R#
      • 1...Sd7
        • 2.Qb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(i);OGATE::PXR(i)=Q
  • Tries
    • Try
      • R(C);CHECK,XS(f)
      • Vars
        • K(k);P-FLIGHT,XS(G)::R1(C)
      • Refutation
        • B(a);P_SPINB(a),XR(C)
    • Try
      • R(C);
      • Threat
        • R1(C)
      • Vars
        • K(k);N_SPINS(f),P-FLIGHT,XS(G)::R(C)
        • R(i);OGATE::PXR(i)=Q
      • Refutation
        • P(h);XR(C)
    • Try
      • P(E);CHECK
      • Vars
        • R(i);N_GUARD,P_SPINR(i)::QAR(E),XR(i)
      • Refutation
        • B(j);XQ(E)
    • Try
      • P(E);CHECK
      • Vars
        • R(i);N_GUARD,P_SPINR(i)::R(E),XR(i)
      • Refutation
        • B(j);XR(E)
  • Actual
    • Q(A);N_PINS(f)
    • Threat
      • QAR1(A)
    • Vars
      • S(f);CHECK,N_GUARD::QAB1(A),XS(f)
      • K(k);P-FLIGHT,XS(G)::QAR2(A)
      • P(h);OGATE,XQ(A)::R(C)
      • R(i);OGATE::PXR(i)=Q
      • S(f);N_GUARD::QAB1(A)
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