MESON Chess Problem Database

Problem Display
PID: 186017 (4K3/8/3pBp2/8/1N2R3/P1k1r1BQ/1p2R3/nr4b1 w - - 0 1)

Stubbs, Arthur Goodwin

The Observer, 1932

(First published on Sun May 8 1932)

4K3/8/3pBp2/8/1N2R3/P1k1r1BQ/1p2R3/nr4b1

#2

8 + 8

15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Re1
      • 2.Bxe1#
    • 1...Rxe2
      • 2.Be1#
    • 1...Rd3
      • 2.Sa2#
    • 1...Rxe4
      • 2.Be5#
    • 1...Sc2
      • 2.Rxc2#
    • 1...Sb3
      • 2.Rc2#
      • 2.Rc4#
    • 1...f5
      • 2.Qh8#
  • Tries
    • 1.Bc4?
      • threat
        • 2.Sa2#
        • 2.Sd5#
      • 1...Rxe2
        • 2.Be1#
      • 1...Rd1
        • 2.Sa2#
      • 1...Rd3
        • 2.Sa2#
      • 1...d5
        • 2.Sa2#
        • 2.Sxd5#
      • 1...Rxe4+!
  • Keys
    • 1.Ba2!
      • threat
        • 2.Qc8#
      • 1...Rxe4+
        • 2.Be5#
      • 1...Rxe2
        • 2.Be1#
      • 1...Rxg3
        • 2.Rc4#
      • 1...Rd3
        • 2.Rc4#
      • 1...Rf3
        • 2.Rc4#
      • 1...Sb3
        • 2.Rc2#
      • 1...f5
        • 2.Qh8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • R(b);N_GUARD::B(C),XR(b)
    • R(f);XR(A)::QAR(D)+B(C),DCHECK
    • R(f);SBLOCK::S(E)
    • R(f);P_PINB(G),XR(F)::QAR(D)+B(C),DCHECK
    • S(a);N_GUARD::R1(A),XS(a)
    • P(h);OGATEB::QAB(D)
  • Tries
    • Try
      • B(G);P_SPINR(F)
      • Threat
        • DUALS(2)
      • Vars
        • R(f);XR(A)::QAR(D)+B(C),DCHECK
        • R(b);::S(E)
        • R(f);N_PINR(F)::S(E)
      • Refutation
        • R(f);CHECK,XR(F)
  • Actual
    • B(G);P_SPINR(F)
    • Threat
      • QAR(D)
    • Vars
      • R(f);CHECK,XR(F)::QAR(D)+B(C),DCHECK
      • R(f);XR(A)::QAR(D)+B(C),DCHECK
      • R(f);N_PINR(F),P_SPINR(f),XB(C)::R1(F)
      • R(f);N_PINR(F)::R1(F)
      • S(a);N_GUARD::R1(A)
      • P(h);OGATEB::QAB(D)
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