MESON Chess Problem Database

Problem Display
PID: 27670 (2qNQ3/n1b5/1k6/4P3/8/2R2B2/5K2/R7 w - - 0 1)

Lebeck, Donald

Mate in Two!! (Lebeck), 1992

2qNQ3/n1b5/1k6/4P3/8/2R2B2/5K2/R7

#2

7 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Sb5
      • 2.Rc6#
      • 2.Qc6#
    • 1...Sc6
      • 2.Qxc6#
  • Tries
    • 1.Rb3+?
      • 1...Sb5
        • 2.Rxb5#
        • 2.Qxb5#
        • 2.Qc6#
      • 1...Kc5!
    • 1.Rc6+?
      • 1...Sxc6
        • 2.Qxc6#
      • 1...Kb5!
    • 1.Qb5+?
      • 1...Sxb5
        • 2.Rc6#
      • 1...Kxb5!
  • Keys
    • 1.Qa4!
      • threat
        • 2.Qa5#
      • 1...Qa6
        • 2.Qxa6#
      • 1...Sc6
        • 2.Rxc6#
        • 2.Qxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • S(b);N_GUARD::QAR1(G),XS(b)
  • Tries
    • Try
      • R(C);CHECK
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(C);CHECK
      • Vars
        • S(b);OGATE,XR(C)::QAR1(G),XS(b)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(G);CHECK
      • Vars
        • S(b);SBLOCK,XQ(G)::R1(C)
      • Refutation
        • K(a);P-FLIGHT,XQ(G)
  • Actual
    • Q(G);
    • Threat
      • QAB1(G)
    • Vars
      • Q(d);N_GUARD::QAR1(G),XQ(d)
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