MESON Chess Problem Database

Problem Display
PID: 229134 (3Nr3/2n1Np2/2R5/3qk3/Q7/B1pP1b2/8/2K5 w - - 0 1)

Leblank, G

De Maasbode, 1926

3Nr3/2n1Np2/2R5/3qk3/Q7/B1pP1b2/8/2K5

#2

7 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd3
      • 2.Sxf7#
    • 1...Qa5
      • 2.Sxf7#
    • 1...Qb5
      • 2.Sxf7#
    • 1...Qc5
      • 2.Sxf7#
    • 1...Qd7
      • 2.Sxf7#
    • 1...f5
      • 2.Sg6#
  • Tries
    • 1.Sg6+?
      • 1...Kf5
        • 2.Qf4#
      • 1...fxg6!
  • Keys
    • 1.Qh4!
      • threat
        • 2.Qf6#
      • 1...Qxc6
        • 2.d4#
      • 1...Qxd3
        • 2.Sxf7#
      • 1...Qe6
        • 2.d4#
      • 1...Qd6
        • 2.Bxd6#
      • 1...Se6
        • 2.Sxf7#
      • 1...f5
        • 2.Sg6#
      • 1...f6
        • 2.Qxf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 4
  • Sets
    • Q(c);N_GUARD,XP(C)::S(G),XP(f)
    • Q(c);N_GUARD::S(G),XP(f)
    • P(f);N_GUARD,SBLOCK::S(F)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR1(D)
      • Refutation
        • P(f);XS(F)
  • Actual
    • Q(D);
    • Threat
      • QAB1(D)
    • Vars
      • Q(c);N_GUARD,XR(E)::P(C)
      • Q(c);N_GUARD,XP(C)::S(G),XP(f)
      • Q(c);N_GUARD::P(C)
      • Q(c);N_GUARD::B(B),XQ(c)
      • S(e);S_CUTQ(c)::S(G),XP(f)
      • P(f);N_GUARD,SBLOCK::S(F)
      • P(f);::QAB1(D),XP(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).