MESON Chess Problem Database

Problem Display
PID: 168415 (6B1/3p4/3P1kNK/4b3/3qPp1R/2R1Nn2/1Q5n/8 w - - 0 1)

Petite, Efren

Sahs (Latvia), 1974

6B1/3p4/3P1kNK/4b3/3qPp1R/2R1Nn2/1Q5n/8

#2

9 + 7

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc3
      • 2.Sd5#
    • 1...Qb6
      • 2.Sd5#
    • 1...Qa7
      • 2.Sd5#
    • 1...Qa4
      • 2.Sd5#
    • 1...Qb4
      • 2.Sd5#
    • 1...Qd5
      • 2.Sxd5#
    • 1...Sf1
      • 2.Sg4#
    • 1...Sg4+
      • 2.Sxg4#
  • Tries
    • 1.Rc8?
      • threat
        • 2.Rf8#
      • 1...Sg4+
        • 2.Sxg4#
      • 1...Qxd6
        • 2.Rxf4#
      • 1...Bxd6
        • 2.Sd5#
      • 1...Qc4
        • 2.Rxf4#
      • 1...Qd5
        • 2.Sxd5#
        • 2.Rxf4#
      • 1...Sg5!
  • Keys
    • 1.Qb6!
      • threat
        • 2.Qd8#
      • 1...Sg4+
        • 2.Sxg4#
      • 1...Qxb6
        • 2.Sd5#
      • 1...Qxd6
        • 2.Sd5#
      • 1...Bxd6
        • 2.Rxf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • Q(c);N_GUARD,XR(B)::S(C)
    • Q(c);N_GUARD::S(C)
    • Q(c);N_GUARD::S(C),XQ(c)
    • S(a);N_GUARD::S(C)
    • S(a);CHECK,N_GUARD::S(C),XS(a)
  • Tries
    • Try
      • R(B);
      • Threat
        • R(B)
      • Vars
        • S(a);CHECK,N_GUARD::S(C),XS(a)
        • Q(c);P_SPINB(e),XP(F)::R(E),XP(d)
        • B(e);P_SPINQ(c),XP(F)::S(C)
        • Q(c);P_SPINB(e)::R(E),XP(d)
      • Refutation
        • S(b);
  • Actual
    • Q(A);
    • Threat
      • QAB(A)
    • Vars
      • S(a);CHECK,N_GUARD::S(C),XS(a)
      • Q(c);N_GUARD,XQ(A)::S(C)
      • Q(c);N_GUARD,P_SPINQ(c),XP(F)::S(C)
      • B(e);N_GUARD,P_SPINB(e),XP(F)::R(E),XP(d)
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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).