MESON Chess Problem Database

Problem Display
PID: 62024 (1bb5/1p4rp/nQ6/4p1R1/4k3/4NNK1/1B2P3/1n6 w - - 0 1)

Ellerman, Arnoldo

L'Alfiere di Re, 1925

1bb5/1p4rp/nQ6/4p1R1/4k3/4NNK1/1B2P3/1n6

#2

7 + 9

81 Chess 1943

SOLUTION

  • SOUND
  • Sets
    • 1...Rxg5+
      • 2.Sxg5#
    • 1...Rc7
      • 2.Rxe5#
    • 1...Rd7
      • 2.Rg4#
    • 1...Sd2
      • 2.Sxd2#
    • 1...Sa3
      • 2.Sd2#
    • 1...Sc3
      • 2.Sd2#
  • Keys
    • 1.Bc1!
      • threat
        • 2.Qxb1#
      • 1...Rxg5+
        • 2.Sxg5#
      • 1...Rc7
        • 2.Rxe5#
      • 1...Rd7
        • 2.Rg4#
      • 1...Sd2
        • 2.Sxd2#
      • 1...Sa3
        • 2.Sd2#
      • 1...Sc3
        • 2.Sd2#
      • 1...Sb4
        • 2.Qxb4#
      • 1...Sc5
        • 2.Qb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(f);CHECK,XR(F)::S(D),XR(f)
    • R(f);N_PINR(F)::R1(F),XP(c)
    • R(f);N_GUARD,N_PINR(F),S_CUTB(i)::R(F)
    • S(a);N_GUARD::S(D),XS(a)
    • S(a);N_GUARD::S(D)
  • Actual
    • B(A);
    • Threat
      • QAB(G),XS(a)
    • Vars
      • R(f);CHECK,XR(F)::S(D),XR(f)
      • R(f);N_PINR(F)::R1(F),XP(c)
      • R(f);N_GUARD,N_PINR(F),S_CUTB(i)::R(F)
      • S(a);N_GUARD::S(D),XS(a)
      • S(a);N_GUARD::S(D)
      • S(d);N_GUARD::QAR(G),XS(d)
      • S(d);N_GUARD::QAR(G)
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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).