MESON Chess Problem Database

Problem Display
PID: 271502 (B2R4/1N5q/1P1Pp3/P2kP3/p3NP2/b1P2Q2/2KP4/4R3 w - - 0 1)

Lytton, Cedric C (was Sells, CCL)

The Problemist, 1956

B2R4/1N5q/1P1Pp3/P2kP3/p3NP2/b1P2Q2/2KP4/4R3

#2

14 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Kc4
      • 2.Qd3#
    • 1...Qxe4+
      • 2.Qxe4#
  • Tries
    • 1.Sc5+?
      • 1...Kc4
        • 2.Qe2#
        • 2.Qf1#
        • 2.Qd3#
      • 1...Qb7!
    • 1.Rc8?
      • threat
        • 2.Qd3#
      • 1...Qxe4+
        • 2.Qxe4#
      • 1...Bc5
        • 2.Rxc5#
      • 1...Qh3
        • 2.Sg3#
        • 2.Sf6#
        • 2.Sd8#
      • 1...Qc7!
    • 1.d3?
      • threat
        • 2.Sf6#
      • 1...Qh2+
        • 2.Sd2#
        • 2.Sf2#
      • 1...Qxe4
        • 2.Qxe4#
      • 1...Qxb7
        • 2.Bxb7#
      • 1...Kc6!
  • Keys
    • 1.d7!
      • threat
        • 2.Sd6#
      • 1...Qxe4+
        • 2.Qxe4#
      • 1...Kc4
        • 2.Qd3#
      • 1...Kc6
        • 2.Sd6#
      • 1...Qxd7
        • 2.Sed6#
      • 1...Bd6
        • 2.Sxd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(c);N_GUARD,S_FLIGHT::QAB1(E)
    • Q(e);CHECK,OGATE,P_SPINQ(e),XS(F)::QAB1(E),XQ(e)
  • Tries
    • Try
      • S(L);CHECK
      • Refutation
        • Q(e);N_PINS(F),P_SPINQ(e)
    • Try
      • R(N);
      • Threat
        • QAR2(E)
      • Vars
        • Q(e);CHECK,OGATE,P_SPINQ(e),XS(F)::QAB1(E),XQ(e)
        • B(a);N_GUARD::R1(N),XB(a)
      • Refutation
        • Q(e);N_PINS(F),P_PINP(D)
    • Try
      • P(C);N_SPINS(F)
      • Threat
        • QAB(E)+S(F),DCHECK
      • Vars
        • Q(e);OGATE,P_PINP(C),P_SPINQ(e),XS(F)::QAB1(E),XQ(e)
        • Q(e);OGATE,P_SPINQ(e),XS(L)::B(M),XQ(e)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • P(K);
    • Threat
      • B(M)+S(L)
    • Vars
      • Q(e);CHECK,OGATE,P_SPINQ(e),XS(F)::QAB1(E),XQ(e)
      • K(c);N_GUARD,S_FLIGHT::QAB1(E)
      • K(c);S_FLIGHT::B(M)+S(L)
      • Q(e);N_PINS(F),P_SPINQ(e),XP(K)::QAB(E)+S(F)
      • B(a);::B(M)+S(L),XB(a)
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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).