MESON Chess Problem Database

Problem Display
PID: 46106 (3R4/2p4q/p1BPp3/5n2/4RP2/1P1k2PQ/3p2p1/1KbN2N1 w - - 0 1)

Lyness, Robert Cranston

Staffordshire Advertiser, 1951

3R4/2p4q/p1BPp3/5n2/4RP2/1P1k2PQ/3p2p1/1KbN2N1

#2

11 + 9

56 The Problemist 2002

SOLUTION

  • SOUND
  • Sets
    • 1...Sxg3
      • 2.Qxg3#
    • 1...Sd4
      • 2.Re3#
    • 1...Sh4
      • 2.gxh4#
    • 1...Sh6
      • 2.g4#
    • 1...Se7
      • 2.dxe7#
    • 1...Sg7
      • 2.dxc7#
  • Tries
    • 1.Qg4?
      • threat
        • 2.Qe2#
      • 1...Sxg3
        • 2.Qf3#
        • 2.Qxg3#
      • 1...Sd4
        • 2.Re3#
      • 1...Qh5!
    • 1.Qh5?
      • threat
        • 2.Qe2#
      • 1...Sxg3
        • 2.Qf3#
      • 1...Sd4
        • 2.Re3#
      • 1...Qxh5!
    • 1.g4+?
      • 1...Se3
        • 2.Qxe3#
      • 1...Sg3
        • 2.Qxg3#
      • 1...Qxh3!
    • 1.dxc7+?
      • 1...Sd4
        • 2.Re3#
        • 2.Rexd4#
        • 2.Rdxd4#
      • 1...Sd6
        • 2.Rxd6#
      • 1...Qd7!
  • Keys
    • 1.Rc4!
      • threat
        • 2.Be4#
      • 1...Sxg3
        • 2.Qxg3#
      • 1...Sxd6
        • 2.Qxh7#
      • 1...Se3
        • 2.Sf2#
      • 1...Sd4
        • 2.Rc3#
      • 1...Sh4
        • 2.gxh4#
      • 1...Sh6
        • 2.g4#
      • 1...Se7
        • 2.dxe7#
      • 1...Sg7
        • 2.dxc7#

This is a version

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(e);OGATE,P_SPINS(e),XP(E)::QAR(F),XS(e)
    • S(e);N_GUARD,SBLOCK::R1(G)
    • S(e);OGATE::QAR(F)+P(E),XS(e)
    • S(e);N_GUARD,S_CUTQ(i)::QAR(F)+P(E)
    • S(e);OGATE::R(K)+P(J),XS(e)
    • S(e);N_GUARD,S_CUTQ(i)::R(K)+P(J),XP(h)
  • Tries
    • Try
      • Q(F);
      • Threat
        • QAB1(F)
      • Vars
        • S(e);N_GUARD,SBLOCK::R1(G)
      • Refutation
        • Q(i);
    • Try
      • Q(F);
      • Threat
        • QAB1(F)
      • Vars
        • S(e);N_GUARD,XP(E)::QAR2(F)
        • S(e);N_GUARD,SBLOCK::R1(G)
      • Refutation
        • Q(i);XQ(F)
    • Try
      • P(E);CHECK
      • Vars
        • S(e);N_GUARD,P_SPINS(e)::QAR1(F),XS(e)
        • S(e);N_GUARD,P_SPINS(e)::QAR(F),XS(e)
      • Refutation
        • Q(i);XQ(F)
    • Try
      • P(J);CHECK,XP(h)
      • Vars
        • S(e);N_GUARD,P_SPINS(e)::R(K),XS(e)
      • Refutation
        • Q(i);P_SPINQ(i)
  • Actual
    • R(G);
    • Threat
      • B(I)
    • Vars
      • S(e);OGATE,P_SPINS(e),XP(E)::QAR(F),XS(e)
      • S(e);OGATEB,P_SPINS(e),XP(J)::QAB(F),XQ(i)
      • S(e);SBLOCK::S(B)
      • S(e);SBLOCK::R1(G)
      • S(e);OGATE::QAR(F)+P(E),XS(e)
      • S(e);N_GUARD,S_CUTQ(i)::QAR(F)+P(E)
      • S(e);OGATE::R(K)+P(J),XS(e)
      • S(e);N_GUARD,S_CUTQ(i)::R(K)+P(J),XP(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).