MESON Chess Problem Database

Problem Display
PID: 351 (b5Q1/7p/5N1p/2np1k1K/3B1p2/2P2p2/4rn2/8 w - - 0 1)

Lindsay, Ruth

The Observer, 1929

(First published on Sun Nov 10 1929)

b5Q1/7p/5N1p/2np1k1K/3B1p2/2P2p2/4rn2/8

#2

5 + 10

887 Mate in Two Moves 1931
15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Re6
      • 2.Qxh7#
    • 1...Sd1
      • 2.Qg4#
    • 1...Sh1
      • 2.Qg4#
    • 1...Sfd3
      • 2.Qg4#
    • 1...Sh3
      • 2.Qg4#
    • 1...Sfe4
      • 2.Qg4#
    • 1...Sg4
      • 2.Qxg4#
    • 1...Sce4
      • 2.Qc8#
    • 1...Se6
      • 2.Qxh7#
  • Tries
    • 1.Sxh7?
      • threat
        • 2.Qg6#
      • 1...Ke4
        • 2.Qg6#
      • 1...Re6!
    • 1.Qxd5+?
      • 1...Re5
        • 2.Qxe5#
      • 1...Bxd5!
  • Keys
    • 1.Se4!
      • threat
        • 2.Sd6#
      • 1...Kxe4
        • 2.Qxh7#
      • 1...Rxe4
        • 2.Qf7#
      • 1...Sfxe4
        • 2.Qg4#
      • 1...Scxe4
        • 2.Qc8#
      • 1...dxe4
        • 2.Qf7#
      • 1...Sb7
        • 2.Qxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • R(a);SBLOCK::QAB(E),XP(i)
    • S(b);N_GUARD::QAB1(E)
    • S(b);N_GUARD::QAB1(E),XS(b)
    • S(e);N_GUARD,S_CUTR(a)::QAB(E)
    • S(e);SBLOCK::QAB(E),XP(i)
  • Tries
    • Try
      • S(D);XP(i)
      • Threat
        • QAB1(E)
      • Vars
        • K(g);S_FLIGHT::QAB(E)
      • Refutation
        • R(a);
    • Try
      • Q(E);CHECK,XP(f)
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::QAR1(E),XR(a)
      • Refutation
        • B(j);XQ(E)
  • Actual
    • S(D);
    • Threat
      • S(D)
    • Vars
      • K(g);S_FLIGHT,XS(D)::QAB(E),XP(i)
      • R(a);SBLOCK,XS(D)::QAR2(E)
      • S(b);N_GUARD,SBLOCK,XS(D)::QAB1(E)
      • S(e);N_GUARD,SBLOCK,XS(D)::QAB(E)
      • P(f);SBLOCK,XS(D)::QAR2(E)
      • S(e);S_CUTB(j)::QAR2(E),XP(f)
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