MESON Chess Problem Database

Problem Display
PID: 49677 (7b/3Q3K/3N4/n1BkpP1R/1Pp1R1Nn/3b2rr/4p1p1/8 w - - 0 1)

Eddy, Edwin John

The Puzzler, 1933

7b/3Q3K/3N4/n1BkpP1R/1Pp1R1Nn/3b2rr/4p1p1/8

#2

9 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Bxe4
      • 2.Sb5#
      • 2.Sb7#
      • 2.Sf7#
      • 2.Sc8#
      • 2.Se8#
    • 1...Bf6
      • 2.Sxf6#
    • 1...Sf3
      • 2.Se3#
    • 1...Sb3
      • 2.Qb7#
    • 1...Sc6
      • 2.Qe6#
      • 2.Qf7#
    • 1...Sb7
      • 2.Qxb7#
  • Tries
    • 1.Rf4?
      • threat
        • 2.Sxc4#
        • 2.Se4#
        • 2.Sb5#
        • 2.Sb7#
        • 2.Sf7#
        • 2.Sc8#
        • 2.Se8#
      • 1...Bxf5+
        • 2.Sxf5#
      • 1...Sxf5
        • 2.Sxf5#
      • 1...Be4
        • 2.Sxe4#
        • 2.Sb5#
        • 2.Sb7#
        • 2.Sf7#
        • 2.Sc8#
        • 2.Se8#
      • 1...Sb7
        • 2.Sxb7#
        • 2.Qxb7#
      • 1...c3
        • 2.Sc4#
        • 2.Sb5#
        • 2.Sb7#
        • 2.Sf7#
        • 2.Sc8#
        • 2.Se8#
      • 1...e4
        • 2.Sxe4#
        • 2.Sb5#
        • 2.Sb7#
        • 2.Sf7#
        • 2.Sc8#
        • 2.Se8#
      • 1...exf4!
    • 1.Qb7+?
      • 1...Sc6
        • 2.Qf7#
      • 1...Sxb7!
  • Keys
    • 1.f6!
      • threat
        • 2.Rxe5#
      • 1...Bxe4+
        • 2.Sf5#
      • 1...Bxf6
        • 2.Sxf6#
      • 1...Sf3
        • 2.Se3#
      • 1...Sf5
        • 2.Rxe5#
      • 1...Sg6
        • 2.Rd4#
      • 1...Sc6
        • 2.Qf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • B(k);N_GUARD::S(C),XB(k)
    • S(g);P_PINR(F),S_CUTR(d)::S(C)
    • S(h);N_GUARD::QAB(H)
    • S(h);N_GUARD::QAB(H),XS(h)
  • Tries
    • Try
      • R(B);P_SPINP(E)
      • Threat
        • DUALS(7)
      • Vars
        • B(c);CHECK,XP(E)::QAR(H)+S(G),XB(c)
        • S(g);P_PINR(F),XP(E)::QAR(H)+S(G),XS(g)
      • Refutation
        • P(j);XR(B)
    • Try
      • Q(H);CHECK
      • Vars
        • S(h);P_SPINS(h),SBLOCK::QAB(H)
      • Refutation
        • S(h);XQ(H)
  • Actual
    • P(E);P_PINP(j),P_SPINR(B)
    • Threat
      • R1(F),XP(j)
    • Vars
      • B(c);CHECK,SBLOCK,XR(B)::QAR(H)+S(G)
      • B(k);XP(E)::S(C),XB(k)
      • S(g);S_CUTR(d)::S(C)
      • S(g);N_PINR(B),N_SPINP(j),P_PINR(F)::R1(B),XP(j)
      • S(g);N_PINR(B),P_PINR(F)::R1(B)
      • S(h);SBLOCK::QAB(H)
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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).