MESON Chess Problem Database

Problem Display
PID: 139247 (1QK5/p4p1p/5B1r/4nN2/p1k1P3/b2NR3/PP1p4/1n6 w - - 0 1)

Thomson, Robert Gavin

The Problemist, 1937

1QK5/p4p1p/5B1r/4nN2/p1k1P3/b2NR3/PP1p4/1n6

#2

9 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Bxb2
      • 2.Qb4#
    • 1...Bb4
      • 2.Qxb4#
    • 1...Bc5
      • 2.Sxe5#
  • Tries
    • 1.Qxe5?
      • threat
        • 2.Qd5#
      • 1...Bc5
        • 2.Qxc5#
      • 1...Sc3!
    • 1.b3+?
      • 1...axb3
        • 2.Qxb3#
      • 1...Kc3!
  • Keys
    • 1.b4!
      • threat
        • 2.Sxe5#
      • 1...Kc3
        • 2.Qc7#
      • 1...Bxb4
        • 2.Qxb4#
      • 1...Sxd3
        • 2.Sd6#
      • 1...axb4 ep
        • 2.Qxb3#
      • 1...Bb2
        • 2.Sxb2#
      • 1...Sf3
        • 2.Sd6#
      • 1...Sg4
        • 2.Sd6#
      • 1...Sc6
        • 2.Sd6#
      • 1...Sg6
        • 2.Sd6#
      • 1...Sd7
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 8
    • REMOVED MATES = 1
  • Sets
    • B(c);N_GUARD,XP(B)::QAR1(H)
    • B(c);N_GUARD::QAR1(H),XB(c)
    • B(c);SBLOCK::S(C),XS(f)
  • Tries
    • Try
      • Q(H);XS(f)
      • Threat
        • QAB1(H)
      • Vars
        • B(c);N_GUARD::QAR1(H),XB(c)
      • Refutation
        • S(a);
    • Try
      • P(B);CHECK
      • Vars
        • P(d);OGATE,XP(B)::QAB1(H),XP(d)
      • Refutation
        • K(e);P-FLIGHT,P_SPINS(f)
  • Actual
    • P(B);
    • Threat
      • S(C),XS(f)
    • Vars
      • K(e);P-FLIGHT,P_SPINS(f)::QAR(H)
      • B(c);OGATE,XP(B)::QAR1(H),XB(c)
      • S(f);XS(C)::S(F)
      • P(d);EP,OGATE,XP(B)::QAB1(H),XP(d)
      • B(c);N_GUARD::S(C),XB(c)
      • S(f);::S(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).