MESON Chess Problem Database

Problem Display
PID: 224824 (4q1Rr/2P2PRp/2b2k2/8/3P4/4r2B/1p3N2/2BK4 w - - 0 1)

Formstecher, Emile

Wilmington (Delaware) Sunday Morning Star, 1887

4q1Rr/2P2PRp/2b2k2/8/3P4/4r2B/1p3N2/2BK4

#2

9 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ke7
      • 2.fxe8S#
      • 2.f8Q#
    • 1...Qe4
      • 2.f8Q#
      • 2.f8R#
    • 1...Qe5
      • 2.f8Q#
      • 2.f8R#
    • 1...Re2
      • 2.Bg5#
    • 1...Ra3
      • 2.Bg5#
    • 1...Rb3
      • 2.Bg5#
    • 1...Rc3
      • 2.Bg5#
    • 1...Rf3
      • 2.Bg5#
    • 1...Re4
      • 2.Bg5#
    • 1...Re6
      • 2.Bg5#
    • 1...Re7
      • 2.Bg5#
    • 1...Be4
      • 2.fxe8S#
  • Tries
    • 1.fxe8S+?
      • 1...Rxe8
        • 2.Bg5#
      • 1...Bxe8!
    • 1.f8Q+?
      • 1...Qf7
        • 2.Rxf7#
        • 2.Qxf7#
      • 1...Qxf8!
    • 1.f8R+?
      • 1...Qf7
        • 2.Rgxf7#
        • 2.Rfxf7#
      • 1...Qxf8!
  • Keys
    • 1.Se4+!
      • 1...Ke7
        • 2.fxe8Q#
        • 2.fxe8S#
        • 2.fxe8B#
        • 2.fxe8R#
        • 2.f8Q#
        • 2.f8B#
      • 1...Qxe4
        • 2.f8Q#
        • 2.f8R#
      • 1...Rxe4
        • 2.Bg5#
      • 1...Bxe4
        • 2.fxe8S#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 7
  • Sets
    • Q(f);N_GUARD::P=Q
    • R(b);OGATE::B(A)
    • R(b);OGATE,SBLOCK::B(A)
    • B(c);N_GUARD,S_CUTR(b)::PXQ(f)=S
  • Tries
    • Try
      • P(G);CHECK,XQ(f)
      • Vars
        • R(b);OGATE,XS(G)::B(A)
      • Refutation
        • B(c);XS(G)
    • Try
      • P(G);CHECK
      • Refutation
        • Q(f);XQ(G)
    • Try
      • P(G);CHECK
      • Refutation
        • Q(f);XR(G)
  • Actual
    • S(C);CHECK
    • Vars
      • Q(f);XS(C)::P=Q
      • R(b);OGATE,XS(C)::B(A)
      • B(c);N_GUARD,S_CUTR(b),XS(C)::PXQ(f)=S
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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).