MESON Chess Problem Database

Problem Display
PID: 45948 (8/3p4/K7/2B5/k1P1Q3/1b6/8/8 w - - 0 1)

Singer, FH

The Problemist, 1987

8/3p4/K7/2B5/k1P1Q3/1b6/8/8

#2

4 + 3

136 Problem Observer 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Bc2
      • 2.Qxc2#
    • 1...Bxc4+
      • 2.Qxc4#
    • 1...d5
      • 2.Qe8#
    • 1...d6
      • 2.Qc6#
      • 2.Qe8#
  • Tries
    • 1.Qb7?
      • threat
        • 2.Qb4#
        • 2.Qb5#
        • 2.Qxd7#
      • 1...d5
        • 2.Qc6#
        • 2.Qb4#
        • 2.Qb5#
        • 2.Qd7#
      • 1...Bd1
        • 2.Qb4#
        • 2.Qb5#
      • 1...Ba2
        • 2.Qb4#
        • 2.Qb5#
      • 1...Bc2
        • 2.Qb4#
        • 2.Qb5#
      • 1...d6
        • 2.Qc6#
        • 2.Qb4#
        • 2.Qb5#
        • 2.Qd7#
      • 1...Bxc4+!
    • 1.Qe1?
      • threat
        • 2.Qb4#
        • 2.Qa5#
      • 1...Bd1
        • 2.Qb4#
        • 2.Qxd1#
      • 1...Ba2
        • 2.Qb4#
      • 1...Bc2
        • 2.Qb4#
      • 1...Bxc4+!
    • 1.Qe3?
      • 1...d5
        • 2.Qe8#
      • 1...Bd1
        • 2.Qa3#
      • 1...Ba2
        • 2.Qa3#
      • 1...Bc2
        • 2.Qa3#
      • 1...d6
        • 2.Qe8#
      • 1...Bxc4+!
  • Keys
    • 1.Qe2!
      • 1...Bxc4+
        • 2.Qxc4#
      • 1...Bd1
        • 2.Qxd1#
        • 2.Qa2#
      • 1...Ba2
        • 2.Qxa2#
      • 1...Bc2
        • 2.Qxc2#
      • 1...d5
        • 2.Qe8#
      • 1...d6
        • 2.Qe8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • B(a);OGATEB::QAB(B),XB(a)
    • B(a);CHECK,OGATE,P_SPINB(a),XP(A)::QAR2(B),XB(a)
    • P(c);OGATEB::QAB(B)
  • Tries
    • Try
      • Q(B);
      • Threat
        • DUALS(3)
      • Refutation
        • B(a);CHECK,XP(A)
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);::QAR1(B)
      • Refutation
        • B(a);CHECK,XP(A)
    • Try
      • Q(B);
      • Vars
        • P(c);OGATEB::QAB(B)
        • B(a);OGATE::QAR1(B)
      • Refutation
        • B(a);CHECK,XP(A)
  • Actual
    • Q(B);
    • Vars
      • B(a);CHECK,OGATE,XP(A)::QAR2(B),XB(a)
      • B(a);N_GUARD::QAR2(B),XB(a)
      • B(a);OGATEB::QAB(B),XB(a)
      • P(c);OGATEB::QAB(B)
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