MESON Chess Problem Database

Problem Display
PID: 190956 (4b3/4bp2/2r5/4RN2/RPk2p2/K2p1B2/1P2n3/8 w - - 0 1)

Holroyd, GC

The Observer, 1938

(First published on Sun Nov 13 1938)

4b3/4bp2/2r5/4RN2/RPk2p2/K2p1B2/1P2n3/8

#2

7 + 8

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rd6
      • 2.Rc5#
      • 2.b5#
    • 1...Bxb4+
      • 2.Rxb4#
    • 1...Bh4
      • 2.b5#
    • 1...Bg5
      • 2.b5#
    • 1...Bf6
      • 2.b5#
    • 1...Bd8
      • 2.b5#
    • 1...Sc3
      • 2.b3#
    • 1...d2
      • 2.Bxe2#
  • Tries
    • 1.Se3+?
      • 1...Kd4
        • 2.Re4#
      • 1...fxe3!
  • Keys
    • 1.Rea5!
      • threat
        • 2.Bd5#
      • 1...Bxb4+
        • 2.Rxb4#
      • 1...d2
        • 2.Bxe2#
      • 1...Rc5
        • 2.b5#
      • 1...Rd6
        • 2.Rc5#
      • 1...Bc5
        • 2.bxc5#
      • 1...Sc3
        • 2.b3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • B(f);CHECK,OGATE,P_SPINB(f),XP(E)::R1(D),XB(f)
    • B(f);N_PINP(E)::R(D)+P(E)
    • S(a);SBLOCK::P(A)
    • P(b);OGATEB::B(C),XS(a)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • K(c);P-FLIGHT::R1(F)
      • Refutation
        • P(d);XS(G)
  • Actual
    • R(F);
    • Threat
      • B(C)
    • Vars
      • B(f);CHECK,OGATE,P_SPINB(f),XP(E)::R1(D),XB(f)
      • P(b);OGATEB::B(C),XS(a)
      • R(e);N_PINP(E),SBLOCK::R(D)+P(E)
      • R(e);N_GUARD,N_PINP(E),S_CUTB(f)::R1(F)
      • B(f);::R(D)+P(E),XB(f)
      • S(a);SBLOCK::P(A)
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