MESON Chess Problem Database

Problem Display
PID: 198702 (3r4/b3Qnp1/6b1/7r/N2kN3/p3p2p/B1P1P3/Kn6 w - - 0 1)

Ellerman, Arnoldo

3rd HM., L'Alfiere di Re, 1921

3r4/b3Qnp1/6b1/7r/N2kN3/p3p2p/B1P1P3/Kn6

#2

7 + 11

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Re5
      • 2.Qb4#
    • 1...Sd2
      • 2.c3#
  • Keys
    • 1.Sd2!
      • threat
        • 2.Sf3#
      • 1...Sxd2
        • 2.c3#
      • 1...exd2
        • 2.e3#
      • 1...Re5
        • 2.Qb4#
      • 1...Rf5
        • 2.Qe4#
      • 1...Be4
        • 2.Qxe4#
      • 1...Se5
        • 2.Qxa7#
      • 1...Sg5
        • 2.Qxg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • R(f);SBLOCK::QAR2(G)
    • S(a);N_GUARD::P(C)
  • Actual
    • S(F);
    • Threat
      • S(F)
    • Vars
      • S(a);N_GUARD,XS(F)::P(C)
      • P(c);OGATE,XS(F)::P(D)
      • R(f);SBLOCK::QAR2(G)
      • R(f);S_CUTB(g)::QAR1(G)
      • B(g);N_GUARD::QAR1(G),XB(g)
      • S(i);SBLOCK,S_CUTR(f)::QAB(G),XB(h)
      • S(i);OGATE::QAB(G),XP(j)
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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).