MESON Chess Problem Database

Problem Display
PID: 271899 (1b3K1Q/4N3/5p2/2p2n2/1R1Pk3/r4r2/6B1/2BR3b w - - 0 1)

Lytton, Cedric C (was Sells, CCL)

The Problemist, 1956

1b3K1Q/4N3/5p2/2p2n2/1R1Pk3/r4r2/6B1/2BR3b

#2

8 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sd6
      • 2.Qh4#
  • Tries
    • 1.Qh4+?
      • 1...Bf4
        • 2.Qxf4#
      • 1...Sxh4!
    • 1.Qh5?
      • threat
        • 2.Qxf5#
      • 1...Sxd4
        • 2.Qd5#
        • 2.Qf5#
      • 1...Sxe7
        • 2.dxc5#
      • 1...Se3
        • 2.Qxf3#
      • 1...Sg3
        • 2.Qd5#
        • 2.dxc5#
      • 1...Sh4
        • 2.Qd5#
        • 2.dxc5#
      • 1...Sd6
        • 2.Qg4#
        • 2.Qh4#
        • 2.Qd5#
      • 1...Sh6
        • 2.Qd5#
        • 2.dxc5#
      • 1...Sg7
        • 2.Qd5#
        • 2.dxc5#
      • 1...Bxg2!
  • Keys
    • 1.Qxf6!
      • threat
        • 2.Qxf5#
        • 2.Qc6#
      • 1...Bxg2
        • 2.Qc6#
      • 1...Sxd4
        • 2.Qf5#
      • 1...Sxe7
        • 2.dxc5#
      • 1...cxd4
        • 2.Qxf5#
      • 1...Re3
        • 2.Qxf5#
      • 1...Ra6
        • 2.Qxf5#
      • 1...Bd6
        • 2.Qxf5#
      • 1...Se3
        • 2.Qxf3#
      • 1...Sg3
        • 2.dxc5#
      • 1...Sh4
        • 2.dxc5#
      • 1...Sd6
        • 2.Qf4#
      • 1...Sh6
        • 2.dxc5#
      • 1...Sg7
        • 2.dxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 12
    • REMOVED MATES = 0
  • Sets
    • S(f);N_GUARD,S_CUTB(h)::QAR(H)
  • Tries
    • Try
      • Q(H);CHECK
      • Vars
        • B(h);N_GUARD,P_SPINB(h)::QAR1(H),XB(h)
      • Refutation
        • S(f);XQ(H)
    • Try
      • Q(H);
      • Threat
        • QAB1(H),XS(f)
      • Vars
        • S(f);N_GUARD,XS(F)::R(D)+P(E),XP(e)
        • S(f);S_CUTR(b)::QAB1(H),XR(c)
      • Refutation
        • B(a);N_SPINR(c),XB(C)
  • Actual
    • Q(H);XP(g)
    • Threat
      • DUALS(2)
    • Vars
      • B(a);N_SPINR(c),XB(C)::QAB(H)
      • S(f);P_PINQ(H),P_SPINS(f),XP(E)::QAB1(H)
      • S(f);N_GUARD,P_PINQ(H),XS(F)::R(D)+P(E),XP(e)
      • P(e);P_SPINP(e),XP(E)::QAB1(H),XS(f)
      • R(b);::QAB1(H),XS(f)
      • B(h);P_PINS(F)::QAB1(H),XS(f)
      • S(f);OGATE,P_PINQ(H)::QAB1(H),XR(c)
      • S(f);N_GUARD,P_PINQ(H)::R(D)+P(E),XP(e)
      • S(f);OGATE,P_PINQ(H)::QAR1(H)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).