MESON Chess Problem Database

Problem Display
PID: 11043 (8/7b/7p/3pp3/1B1kP1Q1/1P3p2/4PK2/7B w - - 0 1)

Ellison, Wallace D

Chess, 1936

8/7b/7p/3pp3/1B1kP1Q1/1P3p2/4PK2/7B

#2

7 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...dxe4
      • 2.Qd7#
  • Tries
    • 1.Qxf3?
      • threat
        • 2.Qc3#
        • 2.Qd3#
        • 2.Qe3#
      • 1...Bxe4
        • 2.Qc3#
        • 2.Qe3#
      • 1...dxe4!
    • 1.Qe6?
      • threat
        • 2.Qxd5#
      • 1...Kxe4
        • 2.Qg4#
      • 1...Bxe4
        • 2.Qb6#
      • 1...dxe4
        • 2.Qc4#
        • 2.Qd7#
        • 2.Qd6#
      • 1...Bg8!
    • 1.Qd7?
      • threat
        • 2.Qxd5#
      • 1...Kxe4
        • 2.Qg4#
      • 1...Bxe4
        • 2.Qa7#
      • 1...Bg8!
    • 1.Qf4?
      • threat
        • 2.Qe3#
      • 1...dxe4
        • 2.Qd2#
      • 1...exf4!
    • 1.Qg5?
      • threat
        • 2.Qe3#
      • 1...Kxe4
        • 2.Qg4#
      • 1...dxe4
        • 2.Qd2#
        • 2.Qd8#
      • 1...hxg5!
  • Keys
    • 1.Qg1!
      • threat
        • 2.Kxf3#
      • 1...Kxe4
        • 2.Qg4#
      • 1...Bxe4
        • 2.Qa1#
      • 1...fxe2
        • 2.Kxe2#
      • 1...dxe4
        • 2.Qd1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(c);OGATEB,P_SPINP(c),SBLOCK,XP(F)::QAR(G)
  • Tries
    • Try
      • Q(G);XP(a)
      • Threat
        • DUALS(3)
      • Refutation
        • P(c);XP(F)
    • Try
      • Q(G);
      • Threat
        • QAR1(G),XP(c)
      • Vars
        • K(b);OGATEB,P-FLIGHT,P_SPINP(a),XP(F)::QAR2(G)
        • B(f);SBLOCK,XP(F)::QAB(G)
      • Refutation
        • B(f);
    • Try
      • Q(G);P_PINP(c)
      • Threat
        • QAR1(G),XP(c)
      • Vars
        • K(b);N_SPINP(c),OGATEB,P-FLIGHT,P_SPINP(a),XP(F)::QAR2(G)
        • B(f);SBLOCK,XP(F)::QAB(G)
      • Refutation
        • B(f);
    • Try
      • Q(G);
      • Threat
        • QAB1(G)
      • Vars
        • P(c);P_SPINP(c),SBLOCK,XP(F)::QAR2(G)
      • Refutation
        • P(d);XQ(G)
    • Try
      • Q(G);
      • Threat
        • QAB1(G)
      • Vars
        • K(b);OGATEB,P-FLIGHT,P_SPINP(a),XP(F)::QAR2(G)
      • Refutation
        • P(e);XQ(G)
  • Actual
    • Q(G);
    • Threat
      • QAB(G)+K(C),XP(a)
    • Vars
      • K(b);OGATEB,P-FLIGHT,P_SPINP(a),XP(F)::QAR2(G)
      • B(f);SBLOCK,XP(F)::QAB(G)
      • P(a);XP(B)::QAB(G)+K(C),XP(a)
      • P(c);SBLOCK,XP(F)::QAR(G)
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