MESON Chess Problem Database

Problem Display
PID: 179863 (8/8/5Q2/pp6/kP6/8/K2b4/8 w - - 0 1)

Howard, David M

Problem Observer, 2011

8/8/5Q2/pp6/kP6/8/K2b4/8

#2

3 + 4

5454 Near Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kxb4
      • 2.Qd4#
    • 1...axb4
      • 2.Qa6#
  • Tries
    • 1.Qb2?
      • threat
        • 2.Qa3#
        • 2.Qb3#
      • 1...Bxb4
        • 2.Qc2#
        • 2.Qb3#
      • 1...Bc1
        • 2.Qb3#
      • 1...axb4!
    • 1.Qb6?
      • threat
        • 2.Qxa5#
      • 1...Kxb4
        • 2.Qd4#
      • 1...axb4
        • 2.Qa7#
        • 2.Qa6#
      • 1...Bxb4!
    • 1.Qe6?
      • threat
        • 2.Qb3#
      • 1...axb4
        • 2.Qa6#
      • 1...Kxb4!
    • 1.Qf7?
      • threat
        • 2.Qb3#
      • 1...axb4
        • 2.Qa7#
      • 1...Kxb4!
  • Keys
    • 1.Qd8!
      • threat
        • 2.Qxa5#
      • 1...Kxb4
        • 2.Qd4#
      • 1...Bxb4
        • 2.Qd1#
      • 1...axb4
        • 2.Qa8#

Anticipated by 185895(1971)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(b);OGATEB,P-FLIGHT,XP(B)::QAR2(C)
    • P(c);OGATEB,SBLOCK,XP(B)::QAR2(C)
  • Tries
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);::QAB1(C)
      • Refutation
        • P(c);XP(B)
    • Try
      • Q(C);
      • Threat
        • QAR1(C),XP(c)
      • Vars
        • K(b);OGATEB,P-FLIGHT,P_SPINP(d),XP(B)::QAR2(C)
      • Refutation
        • B(a);XP(B)
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • P(c);OGATEB,SBLOCK,XP(B)::QAR2(C)
      • Refutation
        • K(b);P-FLIGHT,XP(B)
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • P(c);OGATEB,SBLOCK,XP(B)::QAR(C)
      • Refutation
        • K(b);P-FLIGHT,XP(B)
  • Actual
    • Q(C);
    • Threat
      • QAR1(C),XP(c)
    • Vars
      • K(b);OGATEB,P-FLIGHT,XP(B)::QAR2(C)
      • B(a);OGATE,SBLOCK,XP(B)::QAB(C)
      • P(c);OGATEB,SBLOCK,XP(B)::QAR(C)
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