MESON Chess Problem Database

Problem Display
PID: 50993 (1B1r4/3R4/2Q1pN1p/4r1nP/RN1n1k1P/2p2P2/2B2P2/3K4 w - - 0 1)

Lytton, Cedric C (was Sells, CCL)

The Spectator, 1957

1B1r4/3R4/2Q1pN1p/4r1nP/RN1n1k1P/2p2P2/2B2P2/3K4

#2

12 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sdxf3
      • 2.Sbd5#
    • 1...Sf5
      • 2.Sd3#
    • 1...Sgxf3
      • 2.Qe4#
    • 1...Sh3
      • 2.Qe4#
    • 1...Se4
      • 2.Qxe4#
    • 1...Sf7
      • 2.Qe4#
    • 1...Sh7
      • 2.Qe4#
  • Tries
    • 1.Be4?
      • threat
        • 2.Sd3#
      • 1...Sxe4
        • 2.Qxe4#
      • 1...c2+!
    • 1.Rxd4+?
      • 1...Se4
        • 2.Qxe4#
      • 1...Rxd4+!
  • Keys
    • 1.Rf7!
      • threat
        • 2.Sfd5#
      • 1...Sdxf3+
        • 2.Sbd5#
      • 1...Sf5+
        • 2.Sd3#
      • 1...Sgxf3
        • 2.Qe4#
      • 1...Sxf7
        • 2.Qe4#
      • 1...Rd5
        • 2.Sfxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • S(b);P_PINR(K),SBLOCK,XP(D)::R(E)+S(F),DCHECK
    • S(b);P_PINR(K),SBLOCK::R(E)+S(F),DCHECK
    • S(e);N_GUARD,XP(D)::QAR1(I)
    • S(e);N_GUARD::QAR1(I)
    • S(e);N_GUARD::QAR1(I),XS(e)
  • Tries
    • Try
      • B(B);
      • Threat
        • S(F)
      • Vars
        • S(e);OGATE,XB(B)::QAR1(I),XS(e)
      • Refutation
        • P(a);CHECK
    • Try
      • R(K);CHECK,P_SPINR(K),XS(b)
      • Vars
        • S(e);N_GUARD,P_SPINS(e)::QAR1(I),XS(e)
      • Refutation
        • R(h);CHECK,XR(K)
  • Actual
    • R(K);
    • Threat
      • R(K)+S(J),DCHECK
    • Vars
      • S(b);CHECK,SBLOCK,XP(D)::R(E)+S(F),DCHECK
      • S(b);CHECK,SBLOCK::R(E)+S(F),DCHECK
      • S(e);N_GUARD,XP(D)::QAR1(I)
      • S(e);N_GUARD,XR(K)::QAR1(I)
      • R(h);::R(K)+S(J),DCHECK,XR(h)
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