MESON Chess Problem Database

Problem Display
PID: 51549 (2Q5/8/r2p3K/2PkP3/2nN4/3R1P2/B7/8 w - - 0 1)

Barnes, Barry Peter

The Guardian, 1964

2Q5/8/r2p3K/2PkP3/2nN4/3R1P2/B7/8

#2

8 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe5
      • 2.Qf5#
    • 1...dxc5+
      • 2.Sc6#
    • 1...dxe5+
      • 2.Se6#
  • Tries
    • 1.Bxc4+?
      • 1...Kxe5
        • 2.Qf5#
      • 1...Kxc4!
    • 1.Qxa6?
      • threat
        • 2.Qxd6#
      • 1...Kxc5
        • 2.Qb5#
      • 1...dxc5
        • 2.Qd6#
        • 2.Qe6#
      • 1...dxe5
        • 2.Sb3#
        • 2.Se6#
        • 2.Qxc4#
        • 2.Qc6#
        • 2.Qd6#
      • 1...Kxe5!
    • 1.Qg8+?
      • 1...Kxe5
        • 2.Qg5#
      • 1...Kxc5!
  • Keys
    • 1.Qe8!
      • threat
        • 2.Sb3#
      • 1...dxc5+
        • 2.Sc6#
      • 1...dxe5+
        • 2.Se6#
      • 1...Kxc5
        • 2.Qb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • K(b);N_SPINS(a),OGATEB,P-FLIGHT,XP(F)::QAR1(H)
    • P(d);CHECK,SBLOCK,XP(E)::R(B)+S(D)
    • P(d);CHECK,SBLOCK,XP(F)::R(B)+S(D)
  • Tries
    • Try
      • B(A);CHECK,XS(a)
      • Vars
        • K(b);P-FLIGHT,XP(F)::QAR1(H)
      • Refutation
        • K(b);S_FLIGHT,XB(A)
    • Try
      • Q(H);XR(c)
      • Threat
        • QAR1(H),XP(d)
      • Vars
        • K(b);N_SPINS(a),OGATEB,P-FLIGHT,XP(E)::QAR1(H)
      • Refutation
        • K(b);N_SPINS(a),P-FLIGHT,XP(F)
    • Try
      • Q(H);CHECK
      • Vars
        • K(b);N_SPINS(a),OGATEB,P-FLIGHT,XP(F)::QAR2(H)
      • Refutation
        • K(b);N_SPINS(a),P-FLIGHT,XP(E)
  • Actual
    • Q(H);
    • Threat
      • R(B)+S(D)
    • Vars
      • P(d);CHECK,SBLOCK,XP(E)::R(B)+S(D)
      • P(d);CHECK,SBLOCK,XP(F)::R(B)+S(D)
      • K(b);N_SPINS(a),OGATEB,P-FLIGHT,XP(E)::QAR1(H)
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Developed and maintained by Brian Stephenson.
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