MESON Chess Problem Database

Problem Display
PID: 270941 (3R4/2P1P3/2pKQ1p1/2p5/qp1N4/3k1N2/1pR2p2/1r1b2r1 w - - 0 1)

Ellerman, Arnoldo

Die Schwalbe, 1931

3R4/2P1P3/2pKQ1p1/2p5/qp1N4/3k1N2/1pR2p2/1r1b2r1

#2

8 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Be2
      • 2.Qxe2#
  • Tries
    • 1.Qf5+?
      • 1...Ke3
        • 2.e8Q#
        • 2.e8R#
      • 1...gxf5!
  • Keys
    • 1.Se2!
      • threat
        • 2.Rd2#
      • 1...Kxc2
        • 2.Qc4#
      • 1...Qxc2
        • 2.Kxc6#
      • 1...Bxc2
        • 2.Kxc5#
      • 1...Bxe2
        • 2.Qxe2#
      • 1...f1S
        • 2.Se1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • B(b);N_GUARD::QAB1(E),XB(b)
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • K(f);P-FLIGHT,S_CUTP(k)::P=Q
      • Refutation
        • P(k);XQ(E)
  • Actual
    • S(C);
    • Threat
      • R1(A)
    • Vars
      • K(f);N_GUARD,S_FLIGHT,XR(A)::QAR2(E)
      • Q(g);SBLOCK,XR(A)::R(H)+K(D),XP(j)
      • B(b);SBLOCK,XR(A)::R(H)+K(D),XP(i)
      • B(b);OGATE,XS(C)::QAB1(E),XB(b)
      • P(e);N_GUARD,S_CUTR(c)::S(B)
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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).