MESON Chess Problem Database

Problem Display
PID: 180465 (5r2/b6R/4pkP1/R6K/3q2B1/4pN2/7N/Q7 w - - 0 1)

Lider, Valentin Viktorovich

Thema Danicum, 1981

5r2/b6R/4pkP1/R6K/3q2B1/4pN2/7N/Q7

#2

8 + 6

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qe5+
      • 2.Qxe5#
    • 1...Rf7
      • 2.Rxf7#
    • 1...Ra8
      • 2.Rf7#
    • 1...Rb8
      • 2.Rf7#
    • 1...Rc8
      • 2.Rf7#
    • 1...Rd8
      • 2.Rf7#
    • 1...Re8
      • 2.Rf7#
    • 1...Rg8
      • 2.Rf7#
  • Tries
    • 1.Ra6?
      • threat
        • 2.Rxe6#
      • 1...Qe5+
        • 2.Qxe5#
      • 1...Re8
        • 2.Rf7#
      • 1...Bb6!
    • 1.Qxd4+?
      • 1...e5
        • 2.Qxe5#
        • 2.Qd6#
      • 1...Bxd4!
  • Keys
    • 1.Re5!
      • threat
        • 2.Rxe6#
      • 1...Qxe5+
        • 2.Qxe5#
      • 1...Qxg4+
        • 2.Sxg4#
      • 1...Qc5
        • 2.Rf5#
      • 1...Qd5
        • 2.Rf5#
      • 1...Re8
        • 2.Rf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • Q(b);CHECK,OGATE::QAB1(A),XQ(b)
    • R(f);N_GUARD::R1(H),XR(f)
    • R(f);N_GUARD::R1(H)
  • Tries
    • Try
      • R(E);P_PINP(c)
      • Threat
        • R1(E),XP(c)
      • Vars
        • Q(b);CHECK,OGATE::QAB1(A),XQ(b)
        • R(f);N_GUARD::R1(H)
      • Refutation
        • B(e);N_SPINP(c)
    • Try
      • Q(A);CHECK,XQ(b)
      • Refutation
        • B(e);XQ(A)
  • Actual
    • R(E);N_PINQ(b)
    • Threat
      • R1(E),XP(c)
    • Vars
      • Q(b);CHECK,OGATE,P_SPINQ(b),XR(E)::QAB1(A),XQ(b)
      • Q(b);CHECK,XB(D)::S(B),XQ(b)
      • Q(b);P_PINR(E)::QAB(A)+R(E),DCHECK
      • R(f);N_GUARD::R1(H)
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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).