MESON Chess Problem Database

Problem Display
PID: 64544 (b2R1KBB/5Q2/3n4/3nr1N1/1P1k1r1R/3pN1b1/3P1Pq1/8 w - - 0 1)

Ellerman, Arnoldo

Good Companions (November), 1919

b2R1KBB/5Q2/3n4/3nr1N1/1P1k1r1R/3pN1b1/3P1Pq1/8

#2

11 + 9

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Qe4
      • 2.Se6#
    • 1...Re4
      • 2.Se6#
    • 1...Sc3
      • 2.Sf5#
    • 1...Sxe3
      • 2.fxe3#
    • 1...Sb6
      • 2.Sf5#
    • 1...Sf6
      • 2.Qc4#
    • 1...Sc7
      • 2.Sf5#
    • 1...Sc4
      • 2.Sf5#
    • 1...Se4
      • 2.Se6#
    • 1...Sf5
      • 2.Qa7#
  • Tries
    • 1.Rxf4+?
      • 1...Qe4
        • 2.Sf3#
        • 2.Se6#
      • 1...Sxf4
        • 2.Sf5#
        • 2.Qc4#
        • 2.Qa7#
      • 1...Se4
        • 2.Se6#
        • 2.Qa7#
      • 1...Bxf4!
    • 1.Qxf4+?
      • 1...Qe4
        • 2.Sf3#
        • 2.Se6#
        • 2.Bxe5#
      • 1...Sxf4
        • 2.Sf5#
      • 1...Se4
        • 2.Se6#
        • 2.Bxe5#
      • 1...Bxf4!
  • Keys
    • 1.Bh7!
      • threat
        • 2.Se6#
      • 1...Sxe3
        • 2.fxe3#
      • 1...Qh3
        • 2.Sf3#
      • 1...Sf6
        • 2.Qc4#
      • 1...Sc7
        • 2.Sf5#
      • 1...Sf5
        • 2.Qa7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • Q(a);N_SPINR(e),P_SPINR(g),SBLOCK::S(F)
    • R(e);N_PINQ(G)::S(F)
    • S(f);P_SPINS(h)::S(C)
    • S(f);OGATE,P_SPINS(h),XS(C)::P(B),XS(f)
    • S(f);N_PINQ(G),P_SPINS(h)::QAR1(G)
    • S(h);N_GUARD,P_SPINS(f),SBLOCK::S(C)
    • S(h);N_SPINR(e),P_SPINR(g),P_SPINS(f),SBLOCK::S(F)
    • S(h);N_PINQ(G),P_SPINS(f)::QAB(G)
  • Tries
    • Try
      • R(E);CHECK,N_SPINQ(G),P_PINR(g),XR(e)
      • Refutation
        • B(c);XR(E)
    • Try
      • Q(G);CHECK,N_SPINQ(G),P_PINR(g),XR(e)
      • Vars
        • S(f);P_SPINS(f),XQ(G)::S(C)
      • Refutation
        • B(c);P_SPINB(c),XQ(G)
  • Actual
    • B(J);
    • Threat
      • S(F)
    • Vars
      • S(f);OGATE,P_SPINS(h),XS(C)::P(B),XS(f)
      • Q(a);N_GUARD::S(F)
      • S(f);N_PINQ(G),P_SPINS(h)::QAR1(G)
      • S(f);P_SPINS(h)::S(C)
      • S(h);N_PINQ(G),P_SPINS(f)::QAB(G)
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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).