MESON Chess Problem Database

Problem Display
PID: 27345 (1Bq5/6R1/1knR4/2N5/1P6/4Q3/8/3K4 w - - 0 1)

Lebeck, Donald

Mate in Two!! (Lebeck), 1992

1Bq5/6R1/1knR4/2N5/1P6/4Q3/8/3K4

#2

7 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Qh3
      • 2.Rb7#
    • 1...Qf5
      • 2.Rb7#
    • 1...Qe6
      • 2.Rb7#
    • 1...Qb7
      • 2.Rxb7#
    • 1...Qd8
      • 2.Rb7#
    • 1...Qe8
      • 2.Rb7#
    • 1...Qf8
      • 2.Rb7#
    • 1...Qg8
      • 2.Rb7#
    • 1...Qh8
      • 2.Rb7#
  • Tries
    • 1.Sa4+?
      • 1...Ka6
        • 2.Qb6#
        • 2.Qe2#
        • 2.Qd3#
      • 1...Kb5!
    • 1.Qd3?
      • threat
        • 2.Sa4#
        • 2.Ba7#
      • 1...Qxb8
        • 2.Sa4#
        • 2.Qa6#
      • 1...Qa6
        • 2.Qxa6#
      • 1...Qb7
        • 2.Sa4#
        • 2.Rxb7#
      • 1...Qd7
        • 2.Qa6#
      • 1...Qc7
        • 2.Qa6#
      • 1...Qg4+!
  • Keys
    • 1.Qe2!
      • threat
        • 2.Sa4#
        • 2.Ba7#
      • 1...Qxb8
        • 2.Sa4#
        • 2.Qa6#
      • 1...Qa6
        • 2.Qxa6#
      • 1...Qb7
        • 2.Sa4#
        • 2.Rxb7#
      • 1...Qd7
        • 2.Qa6#
      • 1...Qc7
        • 2.Qa6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 9
  • Sets
    • Q(c);N_GUARD::R1(F)
    • Q(c);N_GUARD::R1(F),XQ(c)
    • Q(c);N_GUARD,P_PINR(E)::R1(F)
  • Tries
    • Try
      • S(D);CHECK
      • Refutation
        • K(a);N_SPINS(b),P-FLIGHT
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);N_GUARD::QAR1(B),XQ(c)
        • Q(c);N_GUARD::QAR1(B)
      • Refutation
        • Q(c);CHECK
  • Actual
    • Q(B);
    • Threat
      • DUALS(2)
    • Vars
      • Q(c);N_GUARD::QAR1(B),XQ(c)
      • Q(c);N_GUARD,P_PINR(E)::QAR1(B)
      • Q(c);N_GUARD::QAR1(B)
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