MESON Chess Problem Database

Problem Display
PID: 214890 (8/8/8/1Pqb1Kp1/2n1B2p/b1Q1N2k/P1R2nR1/1r6 w - - 0 1)

Barrier, ?

St. Louis Globe Democrat, 1877

8/8/8/1Pqb1Kp1/2n1B2p/b1Q1N2k/P1R2nR1/1r6

#2

8 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Tries
    • 1.Sf1+?
      • 1...Qe3
        • 2.Rh2#
      • 1...Sd3
        • 2.Rh2#
      • 1...Se3+!
    • 1.Sxc4+?
      • 1...Qe3
        • 2.Qxe3#
      • 1...Sd3!
    • 1.Rh2+?
      • 1...Kg3
        • 2.Sf1#
      • 1...Kxh2!
  • Keys
    • 1.Rg3+!
      • 1...Kh2
        • 2.Sg4#
      • 1...Kxg3
        • 2.Sf1#
      • 1...hxg3
        • 2.Qh8#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • Q(g);P_SPINQ(g)::R1(C)
        • S(b);P_SPINS(b)::R1(C)
      • Refutation
        • S(e);CHECK,P_SPINS(e)
    • Try
      • S(E);CHECK,XS(e)
      • Vars
        • Q(g);N_GUARD,P_SPINQ(g)::QAR(D),XQ(g)
      • Refutation
        • S(b);P_SPINS(b)
    • Try
      • R(C);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR(D)+S(E),DCHECK
      • Refutation
        • K(d);P-FLIGHT,P_SPINS(b),XR(C)
  • Actual
    • R(C);CHECK
    • Vars
      • K(d);P-FLIGHT,P_SPINS(b)::S(E)
      • K(d);P-FLIGHT,XR(C)::QAR(D)+S(E),DCHECK
      • P(f);SBLOCK,XR(C)::QAR(D)
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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).