MESON Chess Problem Database

Problem Display
PID: 46105 (B7/p5K1/p7/k4P1R/p2nP3/N1p1R3/2N5/4Q1B1 w - - 0 1)

Lyness, Robert Cranston

Sp. Prize, Chess, 1951

B7/p5K1/p7/k4P1R/p2nP3/N1p1R3/2N5/4Q1B1

#2

10 + 6

56 The Problemist 2002

SOLUTION

  • SOUND
  • Sets
    • 1...Sb5
      • 2.Sc4#
  • Tries
    • 1.Sxd4?
      • 1...Kb4
        • 2.Qxc3#
      • 1...Kb6!
    • 1.Qb1?
      • threat
        • 2.Sc4#
        • 2.Qb4#
      • 1...Sxf5+
        • 2.Rxf5#
      • 1...Se6+
        • 2.fxe6#
      • 1...Sxc2
        • 2.Sc4#
        • 2.f6#
      • 1...Sb5
        • 2.Sc4#
      • 1...Sc6
        • 2.Sc4#
      • 1...Sb3!
  • Keys
    • 1.Rxc3!
      • threat
        • 2.Rb3#
        • 2.Rc6#
      • 1...Sxf5+
        • 2.Rxf5#
      • 1...Se6+
        • 2.fxe6#
      • 1...Kb6
        • 2.Rc6#
      • 1...Sxc2
        • 2.Rxc2#
      • 1...Se2
        • 2.f6#
      • 1...Sb3
        • 2.Rxb3#
      • 1...Sf3
        • 2.Rxf3#
      • 1...Sb5
        • 2.Sc4#
      • 1...Sc6
        • 2.Rxc6#

There are these versions: 78654

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • S(c);SBLOCK::S(D)
  • Tries
    • Try
      • S(C);XS(c)
      • Vars
        • K(d);S_FLIGHT::QAB1(A),XP(a)
      • Refutation
        • K(d);N_SPINP(a),S_FLIGHT
    • Try
      • Q(A);N_PINP(a)
      • Threat
        • DUALS(2)
      • Vars
        • S(c);CHECK,OGATE,P_SPINS(c),XP(G)::R(H),XS(c)
        • S(c);CHECK,OGATE::R(H)+P(G),XS(c)
        • S(c);::S(D)
      • Refutation
        • S(c);
  • Actual
    • R(E);XP(a)
    • Threat
      • DUALS(2)
    • Vars
      • S(c);CHECK,OGATE,P_SPINS(c),XP(G)::R(H),XS(c)
      • S(c);CHECK,OGATE::R(H)+P(G),XS(c)
      • K(d);P_SPINS(c),S_FLIGHT::R1(E)
      • S(c);OGATE,XS(C)::QAB(A)+R(E),XS(c)
      • S(c);N_GUARD::R(H)+P(G)
      • S(c);::QAB(A)+R(E),XS(c)
      • S(c);SBLOCK::S(D)
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