MESON Chess Problem Database

Problem Display
PID: 27671 (QNq5/2b5/1kP5/1n6/1R1P4/2B5/1K6/8 w - - 0 1)

Lebeck, Donald

Mate in Two!! (Lebeck), 1992

QNq5/2b5/1kP5/1n6/1R1P4/2B5/1K6/8

#2

7 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Qh3
      • 2.Qa6#
    • 1...Qg4
      • 2.Qa6#
    • 1...Qf5
      • 2.Qa6#
    • 1...Qa6
      • 2.Qxa6#
    • 1...Qe6
      • 2.Qa6#
    • 1...Qd7
      • 2.Sxd7#
      • 2.Qa6#
    • 1...Qd8
      • 2.Qa6#
    • 1...Qe8
      • 2.Qa6#
    • 1...Qf8
      • 2.Sd7#
      • 2.Qa6#
    • 1...Qg8
      • 2.Sd7#
      • 2.Qa6#
    • 1...Qh8
      • 2.Sd7#
      • 2.Qa6#
  • Tries
    • 1.Ra4?
      • threat
        • 2.Ba5#
        • 2.Qa5#
      • 1...Qxb8
        • 2.Ba5#
        • 2.Ra6#
        • 2.Qa6#
      • 1...Bxb8
        • 2.Ba5#
      • 1...Sxc3
        • 2.Qa5#
      • 1...Sxd4
        • 2.Qa5#
      • 1...Sa3
        • 2.Qa5#
      • 1...Sd6
        • 2.Qa5#
      • 1...Qa6
        • 2.Sd7#
        • 2.Rxa6#
        • 2.Qxa6#
      • 1...Sa7!
    • 1.Qb7+?
      • 1...Ka5
        • 2.Qxb5#
      • 1...Qxb7!
  • Keys
    • 1.Rb3!
      • threat
        • 2.Ba5#
        • 2.Qa5#
      • 1...Qxb8
        • 2.Ba5#
      • 1...Bxb8
        • 2.Ba5#
      • 1...Qa6
        • 2.Sd7#
        • 2.Qxa6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 7
  • Sets
    • Q(d);N_GUARD::QAR1(F)
    • Q(d);N_GUARD::QAR1(F),XQ(d)
  • Tries
    • Try
      • R(C);N_PINS(a)
      • Threat
        • DUALS(2)
      • Vars
        • B(c);XS(G)::B(B)
        • S(a);XB(B)::QAB1(F)
        • S(a);XP(D)::QAB1(F)
        • S(a);::QAB1(F)
      • Refutation
        • S(a);
    • Try
      • Q(F);CHECK
      • Vars
        • K(b);N_SPINS(a),OGATE,S_FLIGHT::QAR1(F),XS(a)
      • Refutation
        • Q(d);XQ(F)
  • Actual
    • R(C);
    • Threat
      • DUALS(2)
    • Vars
      • Q(d);XS(G)::B(B)
      • B(c);XS(G)::B(B)
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