MESON Chess Problem Database

Problem Display
PID: 214895 (8/1r2p3/3Rp1B1/1Pp1k1BP/8/6K1/6n1/3Q4 w - - 0 1)

Barrier, ?

St. Louis Globe Democrat, 1878

8/1r2p3/3Rp1B1/1Pp1k1BP/8/6K1/6n1/3Q4

#2

7 + 6

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...c4
      • 2.Qd4#
  • Tries
    • 1.Bf4+?
      • 1...Kf6
        • 2.Qa1#
      • 1...Sxf4!
    • 1.Bh6?
      • threat
        • 2.Bg7#
      • 1...Kf6
        • 2.Qa1#
      • 1...exd6!
    • 1.Qg4?
      • threat
        • 2.Qxe6#
      • 1...exd6
        • 2.Qe4#
      • 1...Sf4
        • 2.Qxf4#
      • 1...Kxd6!
  • Keys
    • 1.Bd2!
      • threat
        • 2.Bc3#
      • 1...Kxd6
        • 2.Bf4#
      • 1...Kf6
        • 2.Qa1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • P(b);N_GUARD::QAB1(A)
  • Tries
    • Try
      • B(D);CHECK
      • Vars
        • K(c);P_SPINP(d),S_FLIGHT::QAB(A)
      • Refutation
        • S(a);XB(D)
    • Try
      • B(D);
      • Threat
        • B(D)
      • Vars
        • K(c);P_SPINP(d),S_FLIGHT::QAB(A)
      • Refutation
        • P(f);XR(F)
    • Try
      • Q(A);
      • Threat
        • QAR1(A),XP(d)
      • Vars
        • P(f);SBLOCK,XR(F)::QAR1(A)
        • S(a);N_GUARD::QAB1(A),XS(a)
      • Refutation
        • K(c);S_FLIGHT,XR(F)
  • Actual
    • B(D);
    • Threat
      • B(D)
    • Vars
      • K(c);S_FLIGHT,XR(F)::QAR(A)+B(D),DCHECK
      • K(c);P_SPINP(d),S_FLIGHT::QAB(A)
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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).