MESON Chess Problem Database

Problem Display
PID: 30101 (3q4/8/4Pp2/2Q5/4k3/5R2/2Pp2P1/3K4 w - - 0 1)

Shire, David J

Problem Observer, 1988

3q4/8/4Pp2/2Q5/4k3/5R2/2Pp2P1/3K4

#2

6 + 4

3256 David Shire Selected Chess Problems 2001

SOLUTION

  • SOUND
  • Sets
    • 1...Qd3
      • 2.cxd3#
    • 1...Qd4
      • 2.Qf5#
    • 1...Qd5
      • 2.Qe3#
  • Tries
    • 1.c4?
      • threat
        • 2.Qe3#
      • 1...Qb6
        • 2.Qd5#
      • 1...Qd4
        • 2.Qf5#
      • 1...Qd3!
    • 1.g3?
      • threat
        • 2.Re3#
        • 2.Rf4#
      • 1...Qd5
        • 2.Qe3#
      • 1...Qc7
        • 2.Re3#
      • 1...Qd3
        • 2.Rf4#
      • 1...Qd4
        • 2.Qf5#
      • 1...Qd6
        • 2.Re3#
      • 1...Qb8
        • 2.Re3#
      • 1...Kxf3!
  • Keys
    • 1.c3!
      • threat
        • 2.Qf5#
      • 1...Qd5
        • 2.Qe3#
      • 1...Qa5
        • 2.Qd4#
      • 1...f5
        • 2.Qxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • Q(d);OGATE::P(B),XQ(d)
    • Q(d);SBLOCK::QAB1(E)
    • Q(d);SBLOCK::QAR1(E)
  • Tries
    • Try
      • P(B);
      • Threat
        • QAR1(E)
      • Vars
        • Q(d);N_GUARD::QAB1(E)
        • Q(d);SBLOCK::QAB1(E)
      • Refutation
        • Q(d);
    • Try
      • P(C);
      • Threat
        • DUALS(2)
      • Vars
        • Q(d);SBLOCK::QAR1(E)
        • Q(d);::R1(D)
        • Q(d);SBLOCK::QAB1(E)
      • Refutation
        • K(b);S_FLIGHT,XR(D)
  • Actual
    • P(B);
    • Threat
      • QAB1(E)
    • Vars
      • Q(d);SBLOCK::QAR1(E)
      • Q(d);N_GUARD::QAR1(E)
      • P(c);::QAB1(E),XP(c)
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