MESON Chess Problem Database

Problem Display
PID: 38404 (3R4/1B6/r4rQ1/B2N1n2/qnpkbb2/3N1R1K/3PP3/8 w - - 0 1)

Karlstrom, Alfred Olaf

4th HM., BCF 016. Ty., 1934-1935

3R4/1B6/r4rQ1/B2N1n2/qnpkbb2/3N1R1K/3PP3/8

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Bxd5
      • 2.Rxf4#
    • 1...Sc2
      • 2.Bc3#
    • 1...Sxd5
      • 2.Bc3#
    • 1...Sc6
      • 2.Bc3#
  • Tries
    • 1.S5xb4+?
      • 1...Qd7
        • 2.Sc2#
      • 1...Rad6
        • 2.Bb6#
      • 1...Bd5
        • 2.Rxf4#
      • 1...Bd6
        • 2.Qxf6#
      • 1...Sd6
        • 2.Qxe4#
      • 1...Rfd6!
    • 1.Qxf6+?
      • 1...Be5
        • 2.Qxe5#
      • 1...Rxf6!
  • Keys
    • 1.Sc7+!
      • 1...Qd7
        • 2.Sb5#
      • 1...Rad6
        • 2.Bb6#
      • 1...Rfd6
        • 2.Se6#
      • 1...Bd5
        • 2.Rxf4#
      • 1...Bd6
        • 2.Qxf6#
      • 1...Sd5
        • 2.Bc3#
      • 1...Sd6
        • 2.Qxe4#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • B(e);OGATEB,P_SPINB(e),XS(G)::R(D),XB(f)
    • S(b);OGATE::B(F)
    • S(b);OGATE,P_SPINS(b),XS(G)::B(F)
  • Tries
    • Try
      • S(G);CHECK,XS(b)
      • Vars
        • Q(a);P_SPINQ(a)::S(G)
        • R(h);P_SPINR(h)::B(F)
        • B(e);P_SPINB(e),S_CUTQ(a),S_CUTR(h),S_CUTR(i),S_CUTS(g)::R(D),XB(f)
        • B(f);P_SPINB(f)::QAB(H),XR(i)
        • S(g);OGATE,P_SPINS(g)::QAR1(H),XB(e)
      • Refutation
        • R(i);P_SPINR(i)
    • Try
      • Q(H);CHECK,XR(i)
      • Vars
        • B(f);N_GUARD,P_SPINB(f)::QAB1(H),XB(f)
      • Refutation
        • R(h);XQ(H)
  • Actual
    • S(G);CHECK
    • Vars
      • Q(a);P_SPINQ(a)::S(G)
      • R(h);P_SPINR(h)::B(F)
      • R(i);P_SPINR(i)::S(G)
      • B(e);P_SPINB(e),S_CUTQ(a),S_CUTR(h),S_CUTR(i),S_CUTS(b),S_CUTS(g)::R(D),XB(f)
      • B(f);P_SPINB(f)::QAB(H),XR(i)
      • S(b);OGATE,P_SPINS(b)::B(F)
      • S(g);OGATE,P_SPINS(g)::QAR1(H),XB(e)
HTML5 logo

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).