MESON Chess Problem Database

Problem Display
PID: 48670 (4N3/1p4Q1/8/nPpk1p2/4R3/1p6/B3N3/b2K4 w - - 0 1)

Collins, Francis Charles

Chess Chips, 1878

4N3/1p4Q1/8/nPpk1p2/4R3/1p6/B3N3/b2K4

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Bc3
      • 2.Sxc3#
    • 1...Be5
      • 2.Qxe5#
    • 1...Sc4
      • 2.Qxb7#
  • Tries
    • 1.Sf6+?
      • 1...Kd6
        • 2.Qd7#
        • 2.Qe7#
      • 1...Bxf6!
    • 1.Sc7+?
      • 1...Kd6
        • 2.Re6#
        • 2.Qe7#
      • 1...Kxe4!
    • 1.Qxb7+?
      • 1...Sc6
        • 2.Qxc6#
      • 1...Sxb7!
    • 1.Qe7?
      • threat
        • 2.Sf4#
        • 2.Sc7#
        • 2.Qe6#
      • 1...Bd4
        • 2.Qe6#
      • 1...Be5
        • 2.Qxe5#
      • 1...c4
        • 2.Sf4#
        • 2.Sc7#
      • 1...f4
        • 2.Sxf4#
        • 2.Sc7#
        • 2.Qe6#
      • 1...fxe4!
  • Keys
    • 1.Qc3!
      • threat
        • 2.Re5#
      • 1...Kxe4
        • 2.Sf6#
      • 1...Bxc3
        • 2.Sxc3#
      • 1...fxe4
        • 2.Sf4#
      • 1...Sc4
        • 2.Qxc4#
      • 1...Sc6
        • 2.Qc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • B(a);N_GUARD::S(C),XB(a)
    • B(a);N_GUARD::QAR1(F),XB(a)
    • S(c);N_GUARD,N_SPINP(b)::QAB(F),XP(g)
  • Tries
    • Try
      • S(G);CHECK
      • Refutation
        • B(a);XS(G)
    • Try
      • S(G);CHECK
      • Refutation
        • K(e);N_SPINP(b),S_FLIGHT,XR(D)
    • Try
      • Q(F);CHECK,XP(g)
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::QAB1(F),XS(c)
      • Refutation
        • S(c);XQ(F)
    • Try
      • Q(F);
      • Threat
        • DUALS(3)
      • Vars
        • B(a);::QAB1(F)
        • B(a);N_GUARD::QAR1(F),XB(a)
      • Refutation
        • P(f);XR(D)
  • Actual
    • Q(F);
    • Threat
      • R1(D)
    • Vars
      • K(e);N_SPINP(b),S_FLIGHT,XR(D)::S(G)
      • B(a);XQ(F)::S(C),XB(a)
      • P(f);SBLOCK,XR(D)::S(C)
      • S(c);N_GUARD,N_SPINP(b)::QAB1(F),XS(c)
      • S(c);N_GUARD::QAB1(F)
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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).