MESON Chess Problem Database

Problem Display
PID: 55393 (4K3/4R3/3N3p/2Pk3p/Q3N1R1/2p2pp1/b4q2/1n6 w - - 0 1)

Petite, Efren

4th HM., Israel Ring Ty., 2001

4K3/4R3/3N3p/2Pk3p/Q3N1R1/2p2pp1/b4q2/1n6

#2

7 + 9

721 Variantim 2004
3713 Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4
      • 2.Qa8#
  • Tries
    • 1.Sb5?
      • threat
        • 2.Sc7#
      • 1...Kc6
        • 2.Sbxc3#
      • 1...Bc4
        • 2.Qa8#
      • 1...Qxc5!
    • 1.Sf7?
      • threat
        • 2.Re5#
      • 1...Bc4
        • 2.Qd7#
      • 1...Qd4!
    • 1.Sc8?
      • threat
        • 2.Sb6#
      • 1...Qxc5
        • 2.Sf6#
      • 1...Bc4
        • 2.Qd7#
      • 1...Qb2!
    • 1.Rf4?
      • threat
        • 2.Rf5#
      • 1...Qd4
        • 2.Qa8#
      • 1...Bc4!
  • Keys
    • 1.Sc4!
      • threat
        • 2.Sb6#
      • 1...Kd4
        • 2.Rd7#
      • 1...Qxc5
        • 2.Sf6#
      • 1...Bxc4
        • 2.Qd7#
      • 1...Qb2
        • 2.Se3#

Anticipated by 25706(1974)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • Q(c);SBLOCK::QAB(A)
  • Tries
    • Try
      • S(E);
      • Threat
        • S(E)
      • Vars
        • K(g);S_FLIGHT::QAB(A)+S(E),XP(d)
        • B(b);SBLOCK::QAB(A)
      • Refutation
        • Q(c);XP(D)
    • Try
      • S(E);
      • Threat
        • R1(F)
      • Vars
        • B(b);SBLOCK::QAR2(A)
      • Refutation
        • Q(c);
    • Try
      • S(E);
      • Threat
        • S(E)
      • Vars
        • Q(c);SBLOCK,XP(D)::S(B)
        • B(b);SBLOCK::QAR2(A)
      • Refutation
        • Q(c);
    • Try
      • R(C);
      • Threat
        • R(C)
      • Vars
        • Q(c);SBLOCK::QAB(A)
      • Refutation
        • B(b);
  • Actual
    • S(E);
    • Threat
      • S(E)
    • Vars
      • K(g);P-FLIGHT::R(F)
      • Q(c);SBLOCK,XP(D)::S(B)
      • B(b);SBLOCK,XS(E)::QAR2(A)
      • Q(c);N_GUARD::S(E)
HTML5 logo

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).