MESON Chess Problem Database

Problem Display
PID: 199239 (4QKn1/2pR4/3p1p2/1n1pNk2/b2p1p1P/5P2/4N2b/4R3 w - - 0 1)

Lyness, Robert Cranston

The Observer, 1945

(First published on Sun Jan 28 1945)

4QKn1/2pR4/3p1p2/1n1pNk2/b2p1p1P/5P2/4N2b/4R3

#2

8 + 11

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Sa3
      • 2.Sxd4#
    • 1...Sc3
      • 2.Sxd4#
    • 1...Sa7
      • 2.Sxd4#
  • Tries
    • 1.Rxd6?
      • threat
        • 2.Qh5#
        • 2.Qe6#
      • 1...Sxd6
        • 2.Sxd4#
      • 1...Se7
        • 2.Qh5#
      • 1...cxd6!
    • 1.Qg6+?
      • 1...Kxe5
        • 2.Sc1#
        • 2.Sg1#
        • 2.Sc3#
        • 2.Sg3#
      • 1...Ke6!
  • Keys
    • 1.Qc8!
      • threat
        • 2.Re7#
      • 1...Kxe5
        • 2.Sg3#
      • 1...Ke6
        • 2.Re7#
      • 1...dxe5
        • 2.Rg7#
      • 1...fxe5
        • 2.Rxd6#
      • 1...Sa3
        • 2.Sxd4#
      • 1...Sc3
        • 2.Sxd4#
      • 1...Sa7
        • 2.Sxd4#
      • 1...Se7
        • 2.Rxe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • S(e);N_GUARD::S(B),XP(c)
  • Tries
    • Try
      • R(F);XP(h)
      • Threat
        • DUALS(2)
      • Vars
        • S(e);N_GUARD,XR(F)::S(B),XP(c)
        • S(k);::QAR2(G)
      • Refutation
        • P(j);XR(F)
    • Try
      • Q(G);CHECK
      • Refutation
        • K(g);P_SPINP(i),S_FLIGHT
  • Actual
    • Q(G);
    • Threat
      • QAB(G)+R(F)
    • Vars
      • K(g);P-FLIGHT,XS(E)::R(A)+S(B)
      • K(g);S_FLIGHT::QAB(G)+R(F),DCHECK
      • P(h);SBLOCK,XS(E)::QAB(G)+R(F)
      • P(i);SBLOCK,XS(E)::QAB(G)+R(F),XP(h)
      • S(e);N_GUARD::S(B),XP(c)
      • S(k);::QAB(G)+R(F),XS(k)
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