MESON Chess Problem Database

Problem Display
PID: 182380 (8/8/4Q1K1/4pp2/4Pk2/4p1R1/8/8 w - - 0 1)

Williams, JD

American Chess Bulletin, 1906

8/8/4Q1K1/4pp2/4Pk2/4p1R1/8/8

#2

4 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe4
      • 2.Qc4#
    • 1...fxe4
      • 2.Qg4#
  • Tries
    • 1.Kf6?
      • threat
        • 2.Qxe5#
      • 1...Kxe4
        • 2.Qc4#
      • 1...Kxg3!
    • 1.Qb3?
      • threat
        • 2.Qxe3#
      • 1...Kxe4
        • 2.Qc4#
      • 1...e2
        • 2.Qe3#
        • 2.Qf3#
      • 1...Kxg3!
  • Keys
    • 1.Rh3!
      • threat
        • 2.Qxf5#
      • 1...Kxe4
        • 2.Qc4#
      • 1...Kg4
        • 2.Qxf5#
      • 1...fxe4
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(b);OGATEB,P-FLIGHT,P_SPINP(c),XP(B)::QAR2(C)
    • P(d);OGATE,SBLOCK,XP(B)::QAR1(C)
  • Tries
    • Try
      • K(D);P-FLIGHT
      • Threat
        • QAB1(C),XP(c)
      • Vars
        • K(b);OGATEB,P-FLIGHT,P_SPINP(c),XP(B)::QAR2(C)
      • Refutation
        • K(b);S_FLIGHT,XR(A)
    • Try
      • Q(C);
      • Threat
        • QAB1(C),XP(a)
      • Vars
        • K(b);OGATEB,P-FLIGHT,XP(B)::QAR2(C)
      • Refutation
        • K(b);P_SPINP(a),S_FLIGHT,XR(A)
  • Actual
    • R(A);
    • Threat
      • QAR1(C),XP(d)
    • Vars
      • K(b);OGATEB,P-FLIGHT,P_SPINP(c),XP(B)::QAR2(C)
      • K(b);P-FLIGHT,P_SPINP(d)::QAB1(C),XP(d)
      • P(d);XP(B)::QAR1(C)
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