MESON Chess Problem Database

Problem Display
PID: 143902 (8/4r2p/P3PQ1K/1ppk4/4N3/2p5/P5B1/8 w - - 0 1)

Filaretov, Sergei P

L'Echiquier, 1926

8/4r2p/P3PQ1K/1ppk4/4N3/2p5/P5B1/8

#2

7 + 6

14868 Pirnie Collection 2012
5454 Near Snap 2019

SOLUTION

  • SOUND
  • Tries
    • 1.Sf2+?
      • 1...Kc4
        • 2.Qh4#
        • 2.Qf4#
      • 1...Kd6!
    • 1.Sxc3+?
      • 1...Kd6
        • 2.Sxb5#
      • 1...Kc4!
    • 1.Sg5+?
      • 1...Kd6
        • 2.Qf4#
      • 1...Kc4!
  • Keys
    • 1.Qf4!
      • threat
        • 2.Sg5#
      • 1...Rxe6+
        • 2.Sf6#
      • 1...Kc4
        • 2.Sf2#
      • 1...Kd4
        • 2.Sf2#
      • 1...Kc6
        • 2.Qd6#
      • 1...Kxe6
        • 2.Sxc5#
      • 1...c4
        • 2.Qd6#

Anticipated by 194030(1917)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(C);CHECK
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • S(C);CHECK,XP(a)
      • Vars
        • K(d);P-FLIGHT::S(C),XP(b)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • S(C);CHECK
      • Vars
        • K(d);P-FLIGHT::QAB(F)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • Q(F);
    • Threat
      • B(B)+S(C)
    • Vars
      • R(e);CHECK,SBLOCK,XP(E)::B(B)+S(C),DCHECK
      • K(d);S_FLIGHT::QAR(F)+S(C)
      • K(d);P-FLIGHT::QAR(F)+S(C)
      • K(d);S_FLIGHT::QAR1(F)
      • K(d);S_FLIGHT,XP(E)::S(C),XP(c)
      • P(c);SBLOCK::QAR1(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).