MESON Chess Problem Database

Problem Display
PID: 61763 (k1N5/8/8/5p2/4p3/pR6/Kb6/7Q w - - 0 1)

Gunn, Robert Ivan

Chess, 1943

k1N5/8/8/5p2/4p3/pR6/Kb6/7Q

#2

4 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...f4
      • 2.Qxe4#
  • Tries
    • 1.Rxb2?
      • 1...f4
        • 2.Qxe4#
      • 1...axb2!
    • 1.Qg1?
      • threat
        • 2.Qa7#
      • 1...e3
        • 2.Qh1#
        • 2.Qg2#
      • 1...Bd4!
    • 1.Qh6?
      • threat
        • 2.Qa6#
        • 2.Qc6#
      • 1...Bd4
        • 2.Qc6#
      • 1...Bf6!
    • 1.Qh7?
      • threat
        • 2.Qa7#
        • 2.Qb7#
      • 1...Bd4
        • 2.Qb7#
      • 1...Bg7!
  • Keys
    • 1.Qb1!
      • 1...Ba1
        • 2.Rxa3#
        • 2.Rb8#
      • 1...Bc1
        • 2.Rb8#
      • 1...Bc3
        • 2.Rb8#
      • 1...Bd4
        • 2.Rb8#
      • 1...Be5
        • 2.Rxa3#
      • 1...Bf6
        • 2.Rxa3#
        • 2.Rb8#
      • 1...Bg7
        • 2.Rxa3#
        • 2.Rb8#
      • 1...Bh8
        • 2.Rxa3#
        • 2.Rb8#
      • 1...e3
        • 2.Qh1#
      • 1...f4
        • 2.Qxe4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • P(d);N_GUARD::QAB(A),XP(c)
  • Tries
    • Try
      • R(C);XB(a)
      • Vars
        • P(d);N_GUARD::QAB(A),XP(c)
      • Refutation
        • P(b);XR(C)
    • Try
      • Q(A);N_PINP(c)
      • Threat
        • QAR1(A)
      • Refutation
        • B(a);
    • Try
      • Q(A);N_PINP(c)
      • Threat
        • DUALS(2)
      • Vars
        • B(a);::QAB(A)
      • Refutation
        • B(a);
    • Try
      • Q(A);N_PINP(c)
      • Threat
        • DUALS(2)
      • Vars
        • B(a);::QAB1(A)
      • Refutation
        • B(a);
  • Actual
    • Q(A);N_PINP(c)
    • Vars
      • B(a);::R1(C)
      • B(a);N_GUARD::R(C),XP(b)
      • P(c);OGATEB::QAB(A)
      • P(d);N_GUARD::QAB(A),XP(c)
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Developed and maintained by Brian Stephenson.
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