MESON Chess Problem Database

Problem Display
PID: 238978 (4KRB1/1pppP3/2Qb2P1/2pN1P1r/P3k1N1/R3Pn2/1p4P1/1q6 w - - 0 1)

Petite, Efren

Problemas, 2002

4KRB1/1pppP3/2Qb2P1/2pN1P1r/P3k1N1/R3Pn2/1p4P1/1q6

#2

13 + 10

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qd3
      • 2.Sc3#
    • 1...Rxf5
      • 2.Sdf6#
    • 1...Be5
      • 2.Sf2#
    • 1...Se5
      • 2.Sf2#
  • Tries
    • 1.Qb5?
      • threat
        • 2.Sc3#
      • 1...Qd3
        • 2.Qxd3#
      • 1...Qc1
        • 2.Qd3#
      • 1...Qe1
        • 2.Qd3#
      • 1...Be5
        • 2.Sf2#
      • 1...c4
        • 2.Sdf6#
      • 1...Qc2!
    • 1.Qxd6?
      • threat
        • 2.Sf2#
        • 2.Sc3#
        • 2.Qf4#
      • 1...Rxf5
        • 2.Sf2#
        • 2.Sc3#
      • 1...Qc2
        • 2.Qf4#
      • 1...Qd3
        • 2.Sf2#
        • 2.Qf4#
      • 1...Qc1
        • 2.Sf2#
        • 2.Qf4#
      • 1...Qe1
        • 2.Qf4#
      • 1...Qf1
        • 2.Sc3#
        • 2.Qf4#
      • 1...Qg1
        • 2.Sc3#
        • 2.Qf4#
      • 1...Sd4
        • 2.Sf2#
        • 2.Qf4#
        • 2.Qe5#
      • 1...Se5
        • 2.Sf2#
        • 2.Sc3#
        • 2.Qxe5#
      • 1...cxd6!
  • Keys
    • 1.Qxd7!
      • threat
        • 2.Sdf6#
      • 1...Rxf5
        • 2.Qxf5#
      • 1...Bxe7
        • 2.Sc3#
      • 1...Be5
        • 2.Sf2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • Q(a);SBLOCK::QAB(H)+S(F),DCHECK
    • R(f);SBLOCK,XP(G)::QAB(H)+S(F),DCHECK
    • B(g);SBLOCK::S(E)
    • S(c);SBLOCK::S(E)
  • Tries
    • Try
      • Q(H);
      • Threat
        • S(F)
      • Vars
        • Q(a);N_GUARD::QAB1(H),XQ(a)
        • Q(a);N_GUARD::QAB1(H)
        • B(g);SBLOCK::S(E)
        • P(e);::S(F)
      • Refutation
        • Q(a);
    • Try
      • Q(H);XB(g)
      • Threat
        • DUALS(3)
      • Vars
        • Q(a);::QAR1(H)
      • Refutation
        • P(i);XQ(H)
  • Actual
    • Q(H);XP(j)
    • Threat
      • S(F)
    • Vars
      • R(f);OGATE,XP(G)::QAB1(H),XR(f)
      • B(g);XP(J)::S(F)
      • B(g);SBLOCK::S(E)
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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).