MESON Chess Problem Database

Problem Display
PID: 6022 (R7/2N5/8/r2B2QK/k4p2/p2n4/N7/8 w - - 0 1)

Thomson, Robert Gavin

HM., Grantham Journal, 1926

R7/2N5/8/r2B2QK/k4p2/p2n4/N7/8

#2

6 + 5

3310 2345 Chess Problems 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Ra6
      • 2.Rxa6#
    • 1...Ra7
      • 2.Rxa7#
    • 1...Sc1
      • 2.Qxf4#
    • 1...Se1
      • 2.Qxf4#
    • 1...Sb4
      • 2.Sc3#
  • Tries
    • 1.Qxf4+?
      • 1...Sb4
        • 2.Sc3#
        • 2.Qxb4#
      • 1...Sxf4+!
    • 1.Qg6?
      • threat
        • 2.Qe8#
        • 2.Qc6#
      • 1...Ra6
        • 2.Rxa6#
        • 2.Qxa6#
      • 1...Ra7
        • 2.Rxa7#
      • 1...Sc5
        • 2.Qc6#
      • 1...Sb4
        • 2.Sc3#
      • 1...Se5
        • 2.Qc2#
      • 1...Rxa8!
  • Keys
    • 1.Qg8!
      • threat
        • 2.Qe8#
      • 1...Rxa8
        • 2.Qxa8#
      • 1...Ra6
        • 2.Rxa6#
      • 1...Ra7
        • 2.Rxa7#
      • 1...Sc5
        • 2.Bc6#
      • 1...Sb4
        • 2.Sc3#
      • 1...Se5
        • 2.Bb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • R(e);OGATEB::R(F),XR(e)
    • S(b);N_GUARD::QAR(C),XP(d)
    • S(b);SBLOCK::S(A)
  • Tries
    • Try
      • Q(C);CHECK,P_SPINB(B),XP(d)
      • Refutation
        • S(b);CHECK,XQ(C)
    • Try
      • Q(C);P_SPINB(B)
      • Threat
        • DUALS(2)
      • Vars
        • R(e);N_PINB(B),OGATEB::R(F),XR(e)
        • S(b);N_PINB(B)::QAB(C)
        • S(b);SBLOCK::S(A)
        • S(b);N_PINB(B),OGATE::QAB(C)
      • Refutation
        • R(e);N_PINB(B),N_SPINR(e),XR(F)
  • Actual
    • Q(C);P_SPINB(B)
    • Threat
      • QAB(C)
    • Vars
      • R(e);N_PINB(B),N_SPINR(e),OGATE,XR(F)::QAR(C),XR(e)
      • R(e);N_PINB(B),OGATEB::R(F),XR(e)
      • S(b);N_PINB(B)::B(B)
      • S(b);SBLOCK::S(A)
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