MESON Chess Problem Database

Problem Display
PID: 83607 (1n1R4/3N1p2/2p1kPR1/2P3p1/K3Bq2/2N5/2P2P2/4Q3 w - - 0 1)

Ellerman, Arnoldo

Revista Romana de Sah, 1927

1n1R4/3N1p2/2p1kPR1/2P3p1/K3Bq2/2N5/2P2P2/4Q3

#2

11 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qe5
      • 2.Sf8#
    • 1...Qxe4+
      • 2.Qxe4#
    • 1...Qf5
      • 2.Bd5#
    • 1...Qxf6
      • 2.Bd3#
    • 1...Sxd7
      • 2.Re8#
  • Keys
    • 1.Qe2!
      • threat
        • 2.Qc4#
      • 1...Qxe4+
        • 2.Qxe4#
      • 1...Qxf6
        • 2.Bd3#
      • 1...Sxd7
        • 2.Re8#
      • 1...Qd2
        • 2.Qg4#
      • 1...Qe5
        • 2.Sf8#
      • 1...Qd6
        • 2.Qg4#
      • 1...Qf5
        • 2.Bd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(a);N_PINB(F),SBLOCK::S(J)
    • Q(a);CHECK,OGATE,P_SPINQ(a),XB(F)::QAR2(A),XQ(a)
    • Q(a);N_PINB(F),SBLOCK::QAR(A)+B(F),DCHECK
    • Q(a);N_PINB(F),P_SPINQ(a),XP(H)::QAR(A)+B(F)
    • S(f);SBLOCK,XS(J)::R(K)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)
    • Vars
      • Q(a);CHECK,OGATE,P_SPINQ(a),XB(F)::QAR2(A),XQ(a)
      • Q(a);N_PINB(F),P_SPINQ(a),XP(H)::QAR(A)+B(F)
      • S(f);SBLOCK,XS(J)::R(K)
      • Q(a);N_GUARD,N_PINB(F)::QAB(A)
      • Q(a);N_PINB(F),SBLOCK::S(J)
      • Q(a);N_PINB(F),SBLOCK::QAR(A)+B(F),DCHECK
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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).