MESON Chess Problem Database

Problem Display
PID: 270187 (Bq1n1R2/3p2pN/1p1Pk3/1p1RN3/7b/4p2r/Q3Pp2/3K1n1b w - - 0 1)

Clark, Cecil Henry Douglas

The Observer, 1958

(First published on Sun Oct 12 1958)

Bq1n1R2/3p2pN/1p1Pk3/1p1RN3/7b/4p2r/Q3Pp2/3K1n1b

#2

9 + 13

17397 Ling Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Bxd5
      • 2.Qxd5#
    • 1...Bg3
      • 2.Sg5#
    • 1...Bg5
      • 2.Sxg5#
    • 1...g5
      • 2.Rf6#
  • Tries
    • 1.Sg6?
      • threat
        • 2.Sf4#
      • 1...Bxd5
        • 2.Qxd5#
      • 1...Rf3
        • 2.Rd2#
        • 2.Rd3#
        • 2.Rd4#
      • 1...Bg3
        • 2.Sg5#
      • 1...Bg5
        • 2.Sxg5#
      • 1...Qxd6!
    • 1.Rd2+?
      • 1...Bd5
        • 2.Qxd5#
      • 1...Kxe5!
    • 1.Rd3+?
      • 1...Bd5
        • 2.Qxd5#
      • 1...Kxe5!
    • 1.Rd4+?
      • 1...Bd5
        • 2.Qxd5#
      • 1...Kxe5!
    • 1.Rxb5+?
      • 1...Bd5
        • 2.Qxd5#
      • 1...Kxd6!
    • 1.Rc5+?
      • 1...Bd5
        • 2.Qxd5#
      • 1...Kxd6!
  • Keys
    • 1.Sd3!
      • threat
        • 2.Sf4#
      • 1...Qxd6
        • 2.Re5#
      • 1...Bxd5
        • 2.Qxd5#
      • 1...Rf3
        • 2.Rd4#
      • 1...Bg3
        • 2.Sg5#
      • 1...Bg5
        • 2.Sxg5#
      • 1...g5
        • 2.Rf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • B(b);OGATE,P_SPINB(b),XR(D)::QAB1(B),XB(b)
    • B(f);N_GUARD::S(G)
    • B(f);N_GUARD::S(G),XB(f)
    • P(k);N_GUARD,S_CUTB(f)::R1(I)
  • Tries
    • Try
      • S(E);
      • Threat
        • S(E)
      • Vars
        • B(b);OGATE,P_SPINB(b),XR(D)::QAB1(B),XB(b)
        • B(f);N_GUARD::S(G)
        • B(f);N_GUARD::S(G),XB(f)
      • Refutation
        • Q(l);P_PINR(D),XP(F)
    • Try
      • R(D);CHECK
      • Vars
        • B(b);N_GUARD,P_SPINB(b)::QAB1(B),XB(b)
      • Refutation
        • K(i);P-FLIGHT,XS(E)
    • Try
      • R(D);CHECK
      • Vars
        • B(b);N_GUARD,P_SPINB(b)::QAB1(B),XB(b)
      • Refutation
        • K(i);P-FLIGHT,XS(E)
    • Try
      • R(D);CHECK
      • Vars
        • B(b);N_GUARD,P_SPINB(b)::QAB1(B),XB(b)
      • Refutation
        • K(i);P-FLIGHT,XS(E)
    • Try
      • R(D);CHECK,XP(g)
      • Vars
        • B(b);N_GUARD,P_SPINB(b)::QAB1(B),XB(b)
      • Refutation
        • K(i);P-FLIGHT,XP(F)
    • Try
      • R(D);CHECK
      • Vars
        • B(b);N_GUARD,P_SPINB(b)::QAB1(B),XB(b)
      • Refutation
        • K(i);P-FLIGHT,XP(F)
  • Actual
    • S(E);
    • Threat
      • S(E)
    • Vars
      • Q(l);SBLOCK,XP(F)::QAB(B)+R(D),DCHECK
      • B(b);OGATE,P_SPINB(b),XR(D)::QAB1(B),XB(b)
      • R(e);S_CUTB(b)::QAB(B)+R(D)
      • B(f);N_GUARD::S(G)
      • B(f);N_GUARD::S(G),XB(f)
      • P(k);N_GUARD,S_CUTB(f)::R1(I)
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