MESON Chess Problem Database

Problem Display
PID: 137892 (4k2n/1NR5/2PB1P2/6P1/8/7p/1K2B1q1/4R3 w - - 0 1)

Ellerman, Arnoldo

1st HM., Shakhmaty, 1927

4k2n/1NR5/2PB1P2/6P1/8/7p/1K2B1q1/4R3

#2

9 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Qf1
      • 2.Bxf1#
      • 2.Bh5#
    • 1...Qh1
      • 2.Bh5#
    • 1...Qf3
      • 2.Bxf3#
    • 1...Qd5
      • 2.Bh5#
    • 1...Qxc6
      • 2.Bb5#
      • 2.Bh5#
    • 1...Qg1
      • 2.Bh5#
    • 1...Qxe2+
      • 2.Rxe2#
    • 1...Qg3
      • 2.Bh5#
    • 1...Qg4
      • 2.Bxg4#
    • 1...Qxg5
      • 2.Bh5#
    • 1...Sg6
      • 2.f7#
  • Keys
    • 1.g6!
      • threat
        • 2.Rc8#
      • 1...Qxe2+
        • 2.Rxe2#
      • 1...Qxc6
        • 2.Bb5#
      • 1...Qxg6
        • 2.Bh5#
      • 1...Sxg6
        • 2.f7#
      • 1...Sf7
        • 2.gxf7#
      • 1...Qg4
        • 2.Bxg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • Q(a);N_PINB(C)::R(A)+B(C),DCHECK
    • Q(a);N_PINB(C)::R(A)+B(C),XQ(a)
    • Q(a);CHECK,OGATE,P_SPINQ(a),XB(C)::R(A),XQ(a)
    • Q(a);N_PINB(C),XP(D)::R(A)+B(C),DCHECK
    • S(d);N_GUARD::P(G)
  • Actual
    • P(D);
    • Threat
      • R(I)
    • Vars
      • Q(a);CHECK,OGATE,P_SPINQ(a),XB(C)::R(A),XQ(a)
      • Q(a);N_PINB(C),XP(E)::R(A)+B(C)
      • Q(a);N_PINB(C),XP(D)::R(A)+B(C)
      • S(d);N_GUARD,XP(D)::P(G)
      • S(d);OGATE::P(D),XS(d)
      • Q(a);N_PINB(C)::R(A)+B(C),XQ(a)
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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).