MESON Chess Problem Database

Problem Display
PID: 233957 (1n1k2nK/1PR5/1PqPbPQN/8/8/8/3R4/8 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Skakbladet, 1979

1n1k2nK/1PR5/1PqPbPQN/8/8/8/3R4/8

#2

9 + 5

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc7
      • 2.dxc7#
    • 1...Bc8
      • 2.bxc8Q#
      • 2.bxc8R#
    • 1...Se7
      • 2.dxe7#
      • 2.fxe7#
  • Tries
    • 1.Sf7+?
      • 1...Ke8
        • 2.Qxg8#
      • 1...Bxf7!
  • Keys
    • 1.d7!
      • threat
        • 2.Qe8#
      • 1...Qxd7
        • 2.Rc8#
      • 1...Qxb6
        • 2.Rc8#
      • 1...Bxd7
        • 2.Qxg8#
      • 1...Sxd7
        • 2.b8Q#
        • 2.b8R#
      • 1...Sxf6
        • 2.Qxf6#
      • 1...Bf7
        • 2.Sxf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • Q(a);OGATE,XR(H)::R(A)+P(C)DCHECK,XQ(a)
    • B(b);OGATE::PXB(b)=Q
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR2(E),XS(e)
      • Refutation
        • B(b);XS(F)
  • Actual
    • P(C);
    • Threat
      • QAR1(E)
    • Vars
      • Q(a);N_GUARD,P_SPINQ(a),XP(C)::R1(H)
      • Q(a);N_GUARD,XP(B)::R1(H)
      • B(b);N_GUARD,P_SPINB(b),XP(C)::QAR(E),XS(e)
      • S(c);OGATE,P_SPINS(c),XP(C)::P=Q
      • S(e);OGATE,XP(D)::QAB(E),XS(e)
      • B(b);N_GUARD::S(F),XB(b)
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