MESON Chess Problem Database

Problem Display
PID: 57416 (3R1B2/2pnr1p1/2bP4/Nn1qk1K1/1Q2PpB1/1N6/8/4R3 w - - 0 1)

Jacobs, Charles Sumner

Chess Life, 1956

3R1B2/2pnr1p1/2bP4/Nn1qk1K1/1Q2PpB1/1N6/8/4R3

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb3
      • 2.Sxc6#
    • 1...Qc4
      • 2.Sxc4#
    • 1...Qe6
      • 2.Sxc6#
    • 1...Qf7
      • 2.Sxc6#
    • 1...Qg8
      • 2.Sxc6#
    • 1...Qd1
      • 2.Sc4#
      • 2.Sxc6#
    • 1...Qd2
      • 2.Sc4#
      • 2.Sxc6#
    • 1...Qd3
      • 2.Sxc6#
    • 1...Qd4
      • 2.Sxc6#
    • 1...Qxd6
      • 2.Sc4#
  • Tries
    • 1.Bxg7+?
      • 1...Sf6
        • 2.Bxf6#
      • 1...Rxg7+!
  • Keys
    • 1.Qd2!
      • threat
        • 2.Qxf4#
      • 1...Kxd6+
        • 2.e5#
      • 1...Qxb3
        • 2.Sxc6#
      • 1...Qxe4
        • 2.Sc4#
        • 2.Sxc6#
      • 1...Qxd2
        • 2.Sc4#
      • 1...Qf7
        • 2.Sxc6#
      • 1...Rf7
        • 2.exd5#
      • 1...f3
        • 2.Qf4#
        • 2.Qh2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • Q(c);N_GUARD,XS(B)::S(F),XB(e)
    • Q(c);N_GUARD::S(F),XQ(c)
    • Q(c);N_GUARD::S(F),XB(e)
    • Q(c);N_GUARD,XP(H)::S(F)
  • Tries
    • Try
      • B(J);CHECK,XP(i)
      • Vars
        • S(g);N_GUARD,P_SPINS(g)::B(J),XS(g)
      • Refutation
        • R(h);CHECK,XB(J)
  • Actual
    • Q(C);
    • Threat
      • QAB1(C),XP(a)
    • Vars
      • K(d);CHECK,OGATE,P_SPINQ(c),P_SPINR(h),P_SPINS(g),S_FLIGHT,XP(H)::P(D)
      • Q(c);N_GUARD,XS(B)::S(F),XB(e)
      • Q(c);N_GUARD,XQ(C)::S(F)
      • Q(c);N_GUARD::S(F),XB(e)
      • R(h);::R(A)+P(D),XQ(c)
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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).