MESON Chess Problem Database

Problem Display
PID: 188000 (1q3b2/pPkp2N1/PpN1R1Qp/7r/1B6/7p/7K/2R5 w - - 0 1)

Lyness, Robert Cranston

The Observer, 1936

(First published on Sun Aug 23 1936)

1q3b2/pPkp2N1/PpN1R1Qp/7r/1B6/7p/7K/2R5

#2

9 + 9

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qe8
      • 2.Sxe8#
    • 1...Bd6+
      • 2.Bxd6#
    • 1...Bxg7
      • 2.Bd6#
    • 1...b5
      • 2.Ba5#
  • Tries
    • 1.Se5+?
      • 1...Kd8
        • 2.Re8#
        • 2.Qe8#
      • 1...Bc5!
  • Keys
    • 1.Qe8!
      • threat
        • 2.Qxb8#
      • 1...Bd6+
        • 2.Bxd6#
      • 1...Qxb7
        • 2.Qd8#
      • 1...Qxe8
        • 2.Sxe8#
      • 1...dxc6
        • 2.Rcxc6#
        • 2.Rexc6#
      • 1...dxe6
        • 2.Sxe6#
      • 1...b5
        • 2.Ba5#
      • 1...Qa8
        • 2.bxa8S#
      • 1...Qc8
        • 2.Qxc8#
        • 2.bxc8Q#
        • 2.bxc8R#
      • 1...Qd8
        • 2.Qxd8#
      • 1...d5
        • 2.Se7#
      • 1...d6
        • 2.Se5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • Q(h);N_GUARD::S(I),XQ(h)
    • B(i);CHECK,N_GUARD::B(C),XB(i)
    • B(i);N_GUARD,XS(I)::B(C)
    • P(c);OGATEB::B(C)
  • Tries
    • Try
      • S(E);CHECK
      • Refutation
        • B(i);P_SPINB(i)
  • Actual
    • Q(G);
    • Threat
      • QAB1(G),XQ(h)
    • Vars
      • B(i);CHECK,N_GUARD::B(C),XB(i)
      • Q(h);N_GUARD,XP(H)::QAB1(G)
      • Q(h);XQ(G)::S(I),XQ(h)
      • P(g);XR(F)::S(I),XP(g)
      • P(c);OGATEB::B(C)
      • Q(h);OGATE::PXQ(h)=S
      • Q(h);N_GUARD::QAB1(G),XQ(h)
      • P(g);S_CUTR(b)::R(A)+S(E)
      • P(g);S_CUTB(i)::R(A)+S(E)
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