MESON Chess Problem Database

Problem Display
PID: 186690 (8/5pK1/3p4/1r1P1k2/4b2p/3N1P2/8/2BQ4 w - - 0 1)

Harrison, G

Chess, 1960

8/5pK1/3p4/1r1P1k2/4b2p/3N1P2/8/2BQ4

#2

6 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Bxf3
      • 2.Qxf3#
  • Tries
    • 1.Qf1?
      • threat
        • 2.Qh3#
      • 1...Bxf3
        • 2.Qxf3#
      • 1...h3
        • 2.Qxh3#
      • 1...Bxd3!
    • 1.Qg1?
      • threat
        • 2.Qg4#
        • 2.Qg5#
      • 1...Rxd5
        • 2.Qg4#
      • 1...Bxd3
        • 2.Qg5#
      • 1...Bxd5
        • 2.Qg4#
      • 1...f6
        • 2.Qg4#
        • 2.Qg6#
      • 1...Bxf3!
    • 1.Qh1?
      • threat
        • 2.Qh3#
      • 1...Bxf3
        • 2.Qxf3#
      • 1...h3
        • 2.Qxh3#
      • 1...Bxd3!
  • Keys
    • 1.Qa4!
      • threat
        • 2.Qxe4#
      • 1...Bxd3
        • 2.Qf4#
      • 1...Bxf3
        • 2.Qf4#
      • 1...Bxd5
        • 2.Qg4#
      • 1...Rb4
        • 2.Qd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(a);OGATE,XP(D)::QAR2(B),XB(a)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAB(B)
      • Vars
        • B(a);OGATE,P_SPINB(a),XP(D)::QAR2(B),XB(a)
        • P(b);::QAB(B),XP(b)
      • Refutation
        • B(a);XS(C)
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • R(c);XP(E)::QAB1(B)
        • B(a);XS(C)::QAR1(B)
        • B(a);XP(E)::QAB1(B)
      • Refutation
        • B(a);XP(D)
    • Try
      • Q(B);
      • Threat
        • QAB(B)
      • Vars
        • B(a);OGATE,XP(D)::QAR2(B),XB(a)
        • P(b);::QAB(B),XP(b)
      • Refutation
        • B(a);XS(C)
  • Actual
    • Q(B);
    • Threat
      • QAB1(B),XB(a)
    • Vars
      • B(a);OGATE,XS(C)::QAR1(B)
      • B(a);OGATE,XP(D)::QAR1(B)
      • B(a);OGATE,XP(E)::QAB1(B)
      • R(c);OGATE::QAB(B)
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