MESON Chess Problem Database

Problem Display
PID: 199469 (1qR2B2/2r1N3/nPN3Q1/P1k1r2R/K3B3/2bP3b/8/8 w - - 0 1)

Starling, WL

The Observer, 1945

(First published on Sun Jul 22 1945)

1qR2B2/2r1N3/nPN3Q1/P1k1r2R/K3B3/2bP3b/8/8

#2

11 + 7

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rd5
      • 2.Rxd5#
    • 1...Be1
      • 2.Rxe5#
    • 1...Bd2
      • 2.Rxe5#
    • 1...Bb4
      • 2.Rxe5#
    • 1...Bd7
      • 2.Sg8#
  • Tries
    • 1.Sf5+?
      • 1...Ree7
        • 2.Qd6#
      • 1...Rce7!
    • 1.Qg1+?
      • 1...Bd4
        • 2.Qxd4#
      • 1...Kd6!
    • 1.d4+?
      • 1...Kc4
        • 2.Bd3#
      • 1...Bxd4!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Sb3#
      • 1...Bd7+
        • 2.Sec6#
      • 1...Kxd4
        • 2.Qg1#
      • 1...Qxb6
        • 2.Qxb6#
      • 1...Bxd4
        • 2.Sg8#
      • 1...Be6
        • 2.Sef5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • R(d);OGATE::R1(E),XR(d)
    • B(a);N_GUARD::R(E),XR(d)
    • B(b);P_PINS(G),S_CUTR(f)::B(K)+S(I)
  • Tries
    • Try
      • S(I);CHECK,N_PINR(d)
      • Vars
        • R(d);P_SPINR(d)::QAB1(H)
      • Refutation
        • R(f);P_SPINR(f)
    • Try
      • Q(H);CHECK
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::QAB1(H),XB(a)
      • Refutation
        • K(c);N_SPINR(d),S_FLIGHT
    • Try
      • P(A);CHECK
      • Vars
        • K(c);N_SPINR(d),P-FLIGHT::B(C)
      • Refutation
        • B(a);XP(A)
  • Actual
    • S(G);
    • Threat
      • S(G)
    • Vars
      • B(b);CHECK,S_CUTR(f)::B(K)+S(I)
      • K(c);N_SPINR(d),OGATEB,S_FLIGHT,XS(G)::QAB(H)
      • Q(g);OGATE,XP(F)::QAB1(H),XQ(g)
      • B(a);SBLOCK,XS(G)::B(K)+S(I)
      • B(b);::B(K)+S(I)
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