MESON Chess Problem Database

Problem Display
PID: 83506 (6B1/8/1p3Rn1/4k1P1/1K1pNr1p/4Pp1q/1NQP2nB/5b2 w - - 0 1)

Ellerman, Arnoldo

3rd Prize, Good Companions (October), 1918

6B1/8/1p3Rn1/4k1P1/1K1pNr1p/4Pp1q/1NQP2nB/5b2

#2

10 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bc4
      • 2.Sxc4#
  • Tries
    • 1.Sf2?
      • threat
        • 2.Qe4#
        • 2.Qc7#
      • 1...dxe3+
        • 2.Qe4#
      • 1...d3+
        • 2.Sc4#
      • 1...Qxh2
        • 2.Qc7#
      • 1...Qf5
        • 2.Qxf5#
        • 2.Qc7#
      • 1...Qd7
        • 2.Qe4#
      • 1...Qc8
        • 2.Qe4#
      • 1...Qg3
        • 2.Qc7#
      • 1...Bd3
        • 2.Sbxd3#
        • 2.Qc7#
      • 1...Bc4
        • 2.Sxc4#
        • 2.Qe4#
      • 1...Qe6!
    • 1.Qc5+?
      • 1...Kxe4
        • 2.Qxd4#
        • 2.Qd5#
      • 1...bxc5+!
  • Keys
    • 1.Sc3!
      • threat
        • 2.Qe4#
      • 1...dxc3+
        • 2.d4#
      • 1...d3+
        • 2.Sc4#
      • 1...Qxh2
        • 2.Re6#
      • 1...Qe6
        • 2.Rxe6#
      • 1...Qf5
        • 2.Qxf5#
      • 1...Qg3
        • 2.Re6#
      • 1...Bd3
        • 2.Sxd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 1
  • Sets
    • B(a);N_GUARD::S(A),XB(a)
  • Tries
    • Try
      • S(G);
      • Threat
        • DUALS(2)
      • Vars
        • P(e);CHECK,XP(E)::QAR1(B)
        • P(e);CHECK,S_CUTB(a)::S(A)
        • Q(d);N_SPINR(f),XB(D)::QAB(B)
        • Q(d);::QAR1(B)
        • Q(d);N_SPINR(f)::QAB(B)
      • Refutation
        • Q(d);
    • Try
      • Q(B);CHECK
      • Refutation
        • P(i);CHECK,XQ(B)
  • Actual
    • S(G);
    • Threat
      • QAR1(B)
    • Vars
      • P(e);CHECK,OGATE,XS(G)::P(C)
      • P(e);CHECK,S_CUTB(a)::S(A)
      • Q(d);N_GUARD,N_SPINR(f),XB(D)::R1(I)
      • Q(d);N_GUARD::R1(I),XQ(d)
      • Q(d);N_GUARD::QAR1(B),XQ(d)
      • Q(d);N_GUARD,N_SPINR(f)::R1(I)
      • B(a);N_GUARD::S(A),XB(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).