MESON Chess Problem Database

Problem Display
PID: 101665 (5Q2/8/8/3NP1p1/2P2pR1/4NkP1/8/B3K3 w - - 0 1)

Robert, Philippe

1st Comm., diagrammes, 1973

5Q2/8/8/3NP1p1/2P2pR1/4NkP1/8/B3K3

#2

9 + 3

274 diagrammes 1974
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Rxf4+?
      • 1...gxf4
        • 2.Qxf4#
      • 1...Kxg3!
    • 1.Qa8?
      • 1...fxe3
        • 2.Sf6#
      • 1...fxg3
        • 2.Qf8#
      • 1...Ke4!
    • 1.gxf4?
      • threat
        • 2.fxg5#
      • 1...gxf4
        • 2.Qxf4#
      • 1...Ke4!
  • Keys
    • 1.Sf6!
      • 1...Kxe3
        • 2.Qa3#
      • 1...fxe3
        • 2.Qa8#
      • 1...fxg3
        • 2.Sfd5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(F);CHECK,XP(b)
      • Vars
        • P(c);OGATE,P_SPINP(c),XR(F)::QAR1(I),XP(c)
      • Refutation
        • K(a);P-FLIGHT,XP(D)
    • Try
      • Q(I);N_PINP(b)
      • Vars
        • P(b);SBLOCK,XS(C)::QAB(I)+S(G)
        • P(b);OGATEB,XP(D)::QAR(I)
      • Refutation
        • K(a);P_SPINP(b),S_FLIGHT
    • Try
      • P(D);XP(b)
      • Threat
        • QAR(I)+P(D),XP(c)
      • Vars
        • P(c);OGATE,P_SPINP(c),XP(D)::QAR1(I),XP(c)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • S(G);N_PINP(b)
    • Vars
      • K(a);OGATEB,P-FLIGHT,XS(C)::QAR(I)
      • P(b);SBLOCK,XS(C)::QAB(I)
      • P(b);XP(D)::QAR(I)+S(G)
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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).