MESON Chess Problem Database

Problem Display
PID: 146943 (8/3p1QpK/5bPN/2r3kp/2r4N/q4pPB/1p6/8 w - - 0 1)

Lyons, Linden

StrateGems, 2012

8/3p1QpK/5bPN/2r3kp/2r4N/q4pPB/1p6/8

#2

7 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qb4
      • 2.Sxf3#
    • 1...Qa1
      • 2.Sxf3#
    • 1...Qa2
      • 2.Sxf3#
    • 1...Qa4
      • 2.Sxf3#
    • 1...Qa5
      • 2.Sxf3#
    • 1...Qa6
      • 2.Sxf3#
    • 1...Qa7
      • 2.Sxf3#
    • 1...Bc3
      • 2.Sxf3#
    • 1...Bd4
      • 2.Qf4#
    • 1...Be5
      • 2.Qf5#
    • 1...Be7
      • 2.Qxe7#
  • Tries
    • 1.Qd5+?
      • 1...Rxd5
        • 2.Sf7#
      • 1...Be5!
    • 1.Qxf6+?
      • 1...gxf6
        • 2.Sf7#
      • 1...Kxf6!
  • Keys
    • 1.Qf8!
      • threat
        • 2.Sf7#
      • 1...gxh6
        • 2.Qxh6#
      • 1...Bc3
        • 2.Sxf3#
      • 1...Bd4
        • 2.Qf4#
      • 1...Be5
        • 2.Qf5#
      • 1...Be7
        • 2.Qxe7#
      • 1...Bd8
        • 2.Qxd8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 7
  • Sets
    • Q(b);N_GUARD::S(C),XP(c)
    • B(h);S_CUTQ(b)::S(C),XP(c)
    • B(h);OGATE::QAB1(F)
    • B(h);OGATE::QAR1(F)
    • B(h);OGATEB::QAB(F),XB(h)
  • Tries
    • Try
      • Q(F);CHECK
      • Vars
        • R(e);XQ(F)::S(E)
      • Refutation
        • B(h);P_SPINB(h)
    • Try
      • Q(F);CHECK,XB(h)
      • Vars
        • P(j);SBLOCK,XQ(F)::S(E)
      • Refutation
        • K(f);S_FLIGHT,XQ(F)
  • Actual
    • Q(F);
    • Threat
      • S(E)
    • Vars
      • P(j);OGATE,XS(E)::QAB1(F),XP(j)
      • B(h);S_CUTQ(b)::S(C),XP(c)
      • B(h);OGATE::QAB1(F)
      • B(h);OGATE::QAR1(F)
      • B(h);OGATEB::QAB(F),XB(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).