MESON Chess Problem Database

Problem Display
PID: 64408 (4q2B/3r1pQ1/2p4R/1p2n3/1R1n4/P1k2B1p/8/1KN2N2 w - - 0 1)

Westbury, Eric Ernest

Good Companions (November), 1917

4q2B/3r1pQ1/2p4R/1p2n3/1R1n4/P1k2B1p/8/1KN2N2

#2

9 + 9

3132 The Good Companion Two-Mover 1922
56 The Problemist 2010

SOLUTION

  • SOUND
  • Sets
    • 1...Sc2
      • 2.Rxc6#
    • 1...Se2
      • 2.Rxc6#
    • 1...Sdxf3
      • 2.Rxc6#
    • 1...Sf5
      • 2.Rxc6#
    • 1...Sd3
      • 2.Sa2#
    • 1...Sexf3
      • 2.Rxc6#
    • 1...Sc4
      • 2.Rb3#
    • 1...Sg4
      • 2.Rxc6#
  • Tries
    • 1.Be2?
      • threat
        • 2.Sa2#
      • 1...Sxe2
        • 2.Rxc6#
      • 1...Qe6!
    • 1.Qg2?
      • threat
        • 2.Qb2#
        • 2.Qd2#
      • 1...Sdxf3
        • 2.Rxc6#
        • 2.Qb2#
        • 2.Qc2#
      • 1...Sexf3
        • 2.Rxc6#
        • 2.Qb2#
        • 2.Qc2#
      • 1...Sc2
        • 2.Rxc6#
        • 2.Qxc2#
      • 1...Se2
        • 2.Rxc6#
      • 1...Sb3
        • 2.Qb2#
        • 2.Qc2#
      • 1...Sf5
        • 2.Rxc6#
        • 2.Qb2#
        • 2.Qc2#
      • 1...Se6
        • 2.Qb2#
        • 2.Qc2#
      • 1...Sd3
        • 2.Sa2#
        • 2.Qc2#
        • 2.Qd2#
      • 1...Sc4
        • 2.Rb3#
        • 2.Qc2#
      • 1...hxg2!
  • Keys
    • 1.Qg3!
      • threat
        • 2.Qe1#
      • 1...Sdxf3
        • 2.Rxc6#
      • 1...Sexf3
        • 2.Rxc6#
      • 1...Sc2
        • 2.Rxc6#
      • 1...Se2
        • 2.Rxc6#
      • 1...Sb3
        • 2.Bd5#
      • 1...Sf5
        • 2.Rxc6#
      • 1...Se6
        • 2.Bd5#
      • 1...Sd3
        • 2.Sa2#
      • 1...Sc4
        • 2.Rb3#
      • 1...Sg4
        • 2.Rxc6#
      • 1...Sg6
        • 2.Be4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD,P_SPINS(e)::R(G),XP(f)
    • S(c);N_GUARD,P_SPINS(e),XB(E)::R(G),XP(f)
    • S(e);P_SPINS(c),SBLOCK::S(B)
    • S(e);N_GUARD,P_SPINS(c),XB(E)::R(G),XP(f)
    • S(e);P_SPINS(c),SBLOCK::R1(F)
    • S(e);N_GUARD,P_SPINS(c)::R(G),XP(f)
  • Tries
    • Try
      • B(E);
      • Threat
        • S(B)
      • Vars
        • S(c);N_GUARD,P_SPINS(e),XB(E)::R(G),XP(f)
      • Refutation
        • Q(i);
    • Try
      • Q(H);
      • Threat
        • DUALS(2)
      • Vars
        • S(c);N_GUARD,P_SPINS(e)::R(G),XP(f)
      • Refutation
        • P(b);XQ(H)
  • Actual
    • Q(H);
    • Threat
      • QAB(H)
    • Vars
      • S(c);N_GUARD,P_SPINS(c),S_CUTS(e),S_CUTS(e),XB(E)::R(G),XP(f)
      • S(e);N_GUARD,P_SPINS(e),S_CUTS(c),XB(E)::R(G),XP(f)
      • S(c);N_GUARD,P_SPINS(e)::R(G),XP(f)
      • S(c);N_GUARD,P_SPINS(e)::QAR(H)+B(E)
      • S(e);P_SPINS(c),SBLOCK::S(B)
      • S(e);P_SPINS(c),SBLOCK::R1(F)
      • S(e);N_GUARD,P_SPINS(c)::R(G),XP(f)
      • S(e);N_GUARD,P_SPINS(c)::QAR(H)+B(E)
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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).