MESON Chess Problem Database

Problem Display
PID: 45945 (8/8/8/5Q2/8/4p2K/6R1/2q4k w - - 0 1)

Vaughan, Colin V

The Problemist, 1978

8/8/8/5Q2/8/4p2K/6R1/2q4k

#2

3 + 3

4883 Still More Fun with Chess Miniatures 2002

SOLUTION

  • SOUND
  • Sets
    • 1...Qb2
      • 2.Qf1#
    • 1...Qd2
      • 2.Qf1#
    • 1...Qa3
      • 2.Qf1#
    • 1...Qb1
      • 2.Qxb1#
    • 1...Qf1
      • 2.Qxf1#
    • 1...Qc2
      • 2.Qf1#
    • 1...Qc3
      • 2.Qf1#
    • 1...Qc5
      • 2.Qf1#
    • 1...Qc6
      • 2.Qf1#
    • 1...Qc7
      • 2.Qf1#
  • Tries
    • 1.Qg4?
      • threat
        • 2.Rh2#
      • 1...Qb2
        • 2.Rg1#
        • 2.Qd1#
      • 1...Qd2
        • 2.Rg1#
      • 1...Qg1
        • 2.Rxg1#
      • 1...Qc2
        • 2.Rg1#
      • 1...Qc7
        • 2.Rg1#
        • 2.Qd1#
      • 1...Qf1!
  • Keys
    • 1.Qf3!
      • threat
        • 2.Rg3#
        • 2.Rg4#
        • 2.Rg5#
        • 2.Rg6#
        • 2.Rg7#
        • 2.Rg8#
      • 1...Qc8+
        • 2.Rg4#
      • 1...Qd1
        • 2.Qxd1#
      • 1...Qb2
        • 2.Qd1#
        • 2.Qf1#
      • 1...Qd2
        • 2.Qf1#
      • 1...Qf1
        • 2.Qxf1#
      • 1...Qg1
        • 2.Rh2#
      • 1...Qc2
        • 2.Qf1#
      • 1...Qc6
        • 2.Qd1#
        • 2.Qf1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • Q(a);N_GUARD::QAR2(C)
    • Q(a);N_GUARD,SBLOCK::QAR2(C)
    • Q(a);OGATEB::QAR(C),XQ(a)
    • Q(a);N_GUARD,P_PINR(A)::QAR2(C),XQ(a)
  • Tries
    • Try
      • Q(C);
      • Threat
        • R1(A)
      • Vars
        • Q(a);N_GUARD::R1(A)
        • Q(a);N_GUARD::R1(A),XQ(a)
      • Refutation
        • Q(a);P_PINR(A)
  • Actual
    • Q(C);
    • Threat
      • DUALS(6)
    • Vars
      • Q(a);CHECK::QAB(C)+R(A)
      • Q(a);N_GUARD::QAR(C),XQ(a)
      • Q(a);N_GUARD::QAR2(C)
      • Q(a);N_GUARD,P_PINR(A)::QAR2(C),XQ(a)
      • Q(a);SBLOCK::QAB(C)+R(A),DCHECK
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