MESON Chess Problem Database

Problem Display
PID: 202880 (4b2Q/1Nn1kp2/5NPK/8/8/7B/8/b7 w - - 0 1)

Rice, John Michael

British Chess Magazine, 2020

4b2Q/1Nn1kp2/5NPK/8/8/7B/8/b7

#2

6 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Ba4
      • 2.Qd8#
    • 1...Bb5
      • 2.Qd8#
    • 1...Bc6
      • 2.Qd8#
    • 1...Bd7
      • 2.Qd8#
    • 1...Sb5
      • 2.Sd5#
    • 1...Sd5
      • 2.Sxd5#
    • 1...Sa6
      • 2.Sd5#
    • 1...Sa8
      • 2.Sd5#
  • Tries
    • 1.g7?
      • threat
        • 2.Sg8#
      • 1...Kxf6
        • 2.g8S#
      • 1...Bxf6
        • 2.Qf8#
      • 1...Ba4
        • 2.Qd8#
      • 1...Bb5
        • 2.Qd8#
      • 1...Bc6
        • 2.Qd8#
      • 1...Bd7
        • 2.Qd8#
      • 1...Se6!
  • Keys
    • 1.gxf7!
      • threat
        • 2.f8Q#
      • 1...Kxf7
        • 2.Qg7#
      • 1...Bxf7
        • 2.Qd8#
      • 1...Se6
        • 2.fxe8Q#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • B(e);OGATE::QAB1(F)
    • S(b);N_GUARD::S(B)
    • S(b);N_GUARD::S(B),XS(b)
  • Tries
    • Try
      • P(C);
      • Threat
        • S(B)
      • Vars
        • K(c);S_FLIGHT,XS(B)::P=S
        • B(a);SBLOCK,XS(B)::QAB1(F)
        • B(e);OGATE::QAB1(F)
      • Refutation
        • S(b);
  • Actual
    • P(C);XP(d)
    • Threat
      • P=Q
    • Vars
      • K(c);OGATEB,P-FLIGHT,XP(C)::QAR1(F)
      • B(e);OGATE,SBLOCK,XP(C)::QAB1(F)
      • S(b);N_GUARD::PXB(e)=Q
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