MESON Chess Problem Database

Problem Display
PID: 208069 (4R1K1/5Qp1/6N1/2r3r1/R1bk4/2n1n3/1P6/1B6 w - - 0 1)

Ellerman, Arnoldo

Il Problema, 1933

4R1K1/5Qp1/6N1/2r3r1/R1bk4/2n1n3/1P6/1B6

#2

7 + 7

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Scd1
      • 2.Re4#
    • 1...Sa2
      • 2.Re4#
    • 1...Se2
      • 2.Re4#
    • 1...Sxa4
      • 2.Re4#
    • 1...Se4
      • 2.Rxe4#
    • 1...Sb5
      • 2.Re4#
    • 1...Scd5
      • 2.Re4#
  • Keys
    • 1.Rd8+!
      • 1...Rcd5
        • 2.Qa7#
      • 1...Rgd5
        • 2.Qxg7#
      • 1...Scd5
        • 2.Qf4#
      • 1...Sed5
        • 2.Qf2#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • S(a);N_GUARD::R1(F)
    • S(a);N_GUARD,N_SPINB(c),XR(C)::R1(F)
    • S(a);N_GUARD::R1(F),XS(a)
    • S(a);N_GUARD,N_PINQ(E)::R1(F)
  • Actual
    • R(F);CHECK
    • Vars
      • R(e);N_PINQ(E),P_SPINR(e)::QAB(E)
      • R(f);N_PINQ(E),P_SPINR(f)::QAB(E),XP(g)
      • S(a);N_PINQ(E),P_SPINS(a)::QAR2(E)
      • S(b);N_PINQ(E),P_SPINS(b)::QAB(E)
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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).