MESON Chess Problem Database

Problem Display
PID: 29054 (4K3/8/3pkp2/4p3/6R1/8/4Q3/8 w - - 0 1)

Riley, HE

Vancouver Province, 1956

4K3/8/3pkp2/4p3/6R1/8/4Q3/8

#2

3 + 4

5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Qc4#
    • 1...e4
      • 2.Qxe4#
  • Tries
    • 1.Rf4?
      • 1...Kd5
        • 2.Qc4#
      • 1...e4
        • 2.Qxe4#
      • 1...d5
        • 2.Qa6#
      • 1...f5!
    • 1.Qd3?
      • 1...e4
        • 2.Qxe4#
      • 1...f5
        • 2.Rg6#
      • 1...d5!
    • 1.Qf3?
      • 1...e4
        • 2.Qxe4#
      • 1...f5
        • 2.Rg6#
      • 1...d5!
    • 1.Qc4+?
      • 1...Kf5
        • 2.Qc8#
      • 1...d5!
    • 1.Qe4?
      • 1...f5
        • 2.Rg6#
      • 1...d5!
  • Keys
    • 1.Qb5!
      • 1...Kf5
        • 2.Qd7#
      • 1...d5
        • 2.Qd7#
      • 1...e4
        • 2.Rxe4#
      • 1...f5
        • 2.Rg6#

This anticipates 15345(1982)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • K(c);N_SPINP(a),S_FLIGHT::QAB1(A)
    • P(a);OGATEB::QAR2(A),XP(a)
  • Tries
    • Try
      • R(B);
      • Vars
        • K(c);N_SPINP(a),S_FLIGHT::QAB1(A)
        • P(a);OGATEB::QAR2(A),XP(a)
        • P(b);OGATEB,SBLOCK::QAR(A)
      • Refutation
        • P(d);
    • Try
      • Q(A);N_PINP(a)
      • Vars
        • P(a);OGATEB::QAR2(A),XP(a)
        • P(d);OGATEB::R(B)
      • Refutation
        • P(b);
    • Try
      • Q(A);N_PINP(a)
      • Vars
        • P(a);OGATEB::QAR2(A),XP(a)
        • P(d);OGATEB::R(B)
      • Refutation
        • P(b);
    • Try
      • Q(A);CHECK,N_PINP(a)
      • Vars
        • K(c);S_FLIGHT::QAB(A)
      • Refutation
        • P(b);P_SPINP(b)
    • Try
      • Q(A);
      • Vars
        • P(d);OGATEB::R(B)
      • Refutation
        • P(b);
  • Actual
    • Q(A);N_PINP(a)
    • Vars
      • K(c);P_SPINP(a),S_FLIGHT::QAB(A)
      • P(b);::QAB1(A)
      • P(a);OGATEB::R(B),XP(a)
      • P(d);OGATEB,SBLOCK::R(B)
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