MESON Chess Problem Database

Problem Display
PID: 83568 (1r2n3/8/R3P1PK/1p3k1N/4pN1p/p6P/r7/B1b2Q2 w - - 0 1)

Ellerman, Arnoldo

Sahovski Glasnik, 1921

1r2n3/8/R3P1PK/1p3k1N/4pN1p/p6P/r7/B1b2Q2

#2

9 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rd2
      • 2.Se2#
    • 1...Ra8
      • 2.Qxb5#
    • 1...Bb2
      • 2.Sd3#
    • 1...Bxf4+
      • 2.Qxf4#
    • 1...Sd6
      • 2.Sg7#
    • 1...Sf6
      • 2.Sg7#
    • 1...Sc7
      • 2.Sg7#
    • 1...Sg7
      • 2.Sxg7#
    • 1...e3
      • 2.Qd3#
  • Keys
    • 1.Rd6!
      • threat
        • 2.Rd5#
      • 1...Bxf4+
        • 2.Qxf4#
      • 1...Sxd6
        • 2.Sg7#
      • 1...Bb2
        • 2.Sd3#
      • 1...e3
        • 2.Qd3#
      • 1...Rd2
        • 2.Se2#
      • 1...Rd8
        • 2.Qxb5#
      • 1...Sf6
        • 2.Sg7#
      • 1...Sc7
        • 2.Sg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • R(b);N_PINS(D)::QAR(B)+S(D)
    • R(h);N_GUARD::QAR(B),XP(f)
    • B(a);N_PINS(D)::QAR(B)+S(D)
    • B(a);CHECK,OGATE,P_SPINB(a),XS(D)::QAR1(B),XB(a)
    • S(i);N_GUARD::S(E)
    • S(i);N_GUARD::S(E),XS(i)
    • P(d);N_PINS(D),OGATEB::QAB(B)
  • Actual
    • R(F);
    • Threat
      • R(F)
    • Vars
      • B(a);CHECK,OGATE,P_SPINB(a),XS(D)::QAR1(B),XB(a)
      • S(i);N_GUARD,XR(F)::S(E)
      • B(a);N_PINS(D)::QAR(B)+S(D)
      • P(d);N_PINS(D),OGATEB::QAB(B)
      • R(b);N_PINS(D)::QAR(B)+S(D)
      • R(h);N_GUARD::QAR(B),XP(f)
      • S(i);N_GUARD::S(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).