MESON Chess Problem Database

Problem Display
PID: 27312 (3k4/N2pn1R1/8/8/8/2Q5/K7/8 w - - 0 1)

Lebeck, Donald

Mate in Two!! (Lebeck), 1992

3k4/N2pn1R1/8/8/8/2Q5/K7/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Sd5
      • 2.Qc8#
    • 1...Sf5
      • 2.Qc8#
    • 1...Sg6
      • 2.Qc8#
    • 1...Sc8
      • 2.Qxc8#
    • 1...Sg8
      • 2.Qc8#
  • Tries
    • 1.Rxe7?
      • 1...d5
        • 2.Qc7#
      • 1...d6
        • 2.Qc7#
      • 1...Kxe7!
    • 1.Qf6?
      • 1...Ke8
        • 2.Qxe7#
      • 1...d5
        • 2.Qxe7#
      • 1...d6
        • 2.Qxe7#
      • 1...Kc7!
  • Keys
    • 1.Qe5!
      • 1...Ke8
        • 2.Qxe7#
      • 1...d5
        • 2.Qxe7#
      • 1...d6
        • 2.Qxe7#
      • 1...Sd5
        • 2.Rg8#
        • 2.Qb8#
      • 1...Sf5
        • 2.Rg8#
        • 2.Qb8#
      • 1...Sc6
        • 2.Rg8#
      • 1...Sg6
        • 2.Qb8#
      • 1...Sc8
        • 2.Rg8#
      • 1...Sg8
        • 2.Rxg8#
        • 2.Qb8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • S(b);N_GUARD::QAR1(B)
    • S(b);N_GUARD::QAR1(B),XS(b)
  • Tries
    • Try
      • R(D);XS(b)
      • Vars
        • P(a);::QAB1(B)
      • Refutation
        • K(c);S_FLIGHT,XR(D)
    • Try
      • Q(B);P_PINS(b)
      • Vars
        • K(c);N_SPINS(b),P-FLIGHT::QAR1(B),XS(b)
        • P(a);::QAB1(B),XS(b)
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(c);P-FLIGHT,P_SPINS(b)::QAR1(B),XS(b)
      • P(a);::QAB1(B),XS(b)
      • S(b);N_GUARD::R(D)
      • S(b);N_GUARD::QAR2(B)
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