MESON Chess Problem Database

Problem Display
PID: 166577 (8/1Q6/8/8/p1p5/1Bk5/3R4/3K4 w - - 0 1)

Ouellet, Charles

The Problemist, 2017

8/1Q6/8/8/p1p5/1Bk5/3R4/3K4

#2

4 + 3

SOLUTION

  • SOUND
  • Tries
    • 1.Bxc4?
      • 1...a3
        • 2.Qb3#
      • 1...Kxc4!
    • 1.Qb6?
      • 1...axb3
        • 2.Qa5#
      • 1...cxb3
        • 2.Qd4#
        • 2.Qc5#
      • 1...a3!
    • 1.Qg7+?
      • 1...Kxb3
        • 2.Qb2#
      • 1...Kb4!
  • Keys
    • 1.Qb5!
      • threat
        • 2.Qxc4#
      • 1...axb3
        • 2.Qa5#
      • 1...cxb3
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(C);XP(c)
      • Vars
        • P(b);N_GUARD::QAR1(D)
      • Refutation
        • K(a);P-FLIGHT,XB(C)
    • Try
      • Q(D);
      • Vars
        • P(b);SBLOCK,XB(C)::QAB(D)
      • Refutation
        • P(b);
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT,XB(C)::QAR1(D)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(D);
    • Threat
      • QAR1(D),XP(c)
    • Vars
      • P(b);SBLOCK,XB(C)::QAB(D)
      • P(c);OGATEB,SBLOCK,XB(C)::QAR2(D)
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