MESON Chess Problem Database

Problem Display
PID: 205648 (2NnR3/p6B/bBP1P1N1/3kP3/QKR2p2/n1P2p2/2prr3/8 w - - 0 1)

Clark, Cecil Henry Douglas

The Observer, 1953

(First published on Sun Jun 21 1953)

2NnR3/p6B/bBP1P1N1/3kP3/QKR2p2/n1P2p2/2prr3/8

#2

12 + 10

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rd4
      • 2.Rxd4#
    • 1...Rxe5
      • 2.Sxf4#
    • 1...Sxc6+
      • 2.Qxc6#
    • 1...Sxe6
      • 2.Sce7#
    • 1...axb6
      • 2.Sxb6#
  • Tries
    • 1.Bc7?
      • threat
        • 2.Sxf4#
      • 1...Sxc6+
        • 2.Qxc6#
      • 1...Sxe6
        • 2.Sge7#
        • 2.Sce7#
      • 1...Rd4
        • 2.Rxd4#
      • 1...Re4!
  • Keys
    • 1.Bd4!
      • threat
        • 2.Sxf4#
      • 1...Sxc6+
        • 2.Qxc6#
      • 1...Ke4
        • 2.Sge7#
      • 1...Rxd4
        • 2.Rxd4#
      • 1...Sxe6
        • 2.Sge7#
      • 1...Re4
        • 2.Rc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • R(b);N_GUARD,P_PINR(D)::R1(D),XR(b)
    • R(c);SBLOCK,XP(E)::S(I),XP(f)
    • S(j);CHECK,OGATE,XP(G)::QAB1(B),XS(j)
    • S(j);SBLOCK,XP(H)::S(K)
    • P(i);XB(F)::S(K),XP(i)
  • Tries
    • Try
      • B(F);
      • Threat
        • S(I),XP(f)
      • Vars
        • S(j);CHECK,OGATE,XP(G)::QAB1(B),XS(j)
        • R(b);N_GUARD,P_PINR(D)::R1(D),XR(b)
      • Refutation
        • R(c);P_PINR(D)
  • Actual
    • B(F);
    • Threat
      • S(I),XP(f)
    • Vars
      • S(j);CHECK,OGATE,XP(G)::QAB1(B),XS(j)
      • K(g);S_FLIGHT::B(J)+S(I)
      • R(b);OGATE,P_PINR(D),XB(F)::R1(D),XR(b)
      • S(j);SBLOCK,XP(H)::S(I)
      • R(c);SBLOCK::R1(D)
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