MESON Chess Problem Database

Problem Display
PID: 204484 (5R2/2Q4p/7N/r3pKP1/p3p1N1/bppnpkPR/q7/1br1nB2 w - - 0 1)

Ellerman, Arnoldo

Tijdschrift vd NSB, 1925

5R2/2Q4p/7N/r3pKP1/p3p1N1/bppnpkPR/q7/1br1nB2

#2

9 + 15

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sf2
      • 2.Sh2#
    • 1...Sb4
      • 2.Ke6#
    • 1...Sf4
      • 2.gxf4#
    • 1...Sc5
      • 2.Kxe5#
  • Tries
    • 1.Ke6+?
      • 1...Sf4+
        • 2.gxf4#
      • 1...Bxf8!
  • Keys
    • 1.Qc4!
      • threat
        • 2.Qxe4#
      • 1...Sb2
        • 2.Qe2#
      • 1...Sf2
        • 2.Sh2#
      • 1...Sb4
        • 2.Ke6#
      • 1...Sf4
        • 2.gxf4#
      • 1...Sc5
        • 2.Kxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(h);SBLOCK,S_CUTQ(d)::S(D)
    • S(h);N_GUARD,S_CUTB(e)::R(I)+K(E)
    • S(h);OGATE::R(C)+P(B),XS(h)
    • S(h);::R(I)+K(E),XP(n)
  • Tries
    • Try
      • K(E);CHECK,S_FLIGHT
      • Vars
        • S(h);CHECK,OGATE,P_SPINS(h)::R(C)+P(B),XS(h)
      • Refutation
        • B(e);XR(I)
  • Actual
    • Q(H);
    • Threat
      • QAB1(H),XP(l)
    • Vars
      • S(h);OGATE::QAB1(H)
      • S(h);SBLOCK,S_CUTQ(d)::S(D)
      • S(h);N_GUARD,S_CUTB(e)::R(I)+K(E)
      • S(h);OGATE::R(C)+P(B),XS(h)
      • S(h);::R(I)+K(E),XP(n)
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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).