MESON Chess Problem Database

Problem Display
PID: 83604 (4NnR1/6r1/4p3/2prk1N1/pnP5/q3BK2/4QP2/1B6 w - - 0 1)

Ellerman, Arnoldo

Western Morning News, 1926

(First published on Sat Feb 6 1926)

4NnR1/6r1/4p3/2prk1N1/pnP5/q3BK2/4QP2/1B6

#2

9 + 9

6490 yacpdb 2009
15239 Valois Notebooks 2024

SOLUTION

  • SOUND
  • Sets
    • 1...Qa1
      • 2.Bxc5#
    • 1...Qxe3+
      • 2.Qxe3#
    • 1...Rxg5
      • 2.Rxg5#
    • 1...Rg6
      • 2.Sf7#
    • 1...Rf7+
      • 2.Sxf7#
    • 1...Rxg8
      • 2.Sf7#
  • Keys
    • 1.Kg4!
      • threat
        • 2.f4#
      • 1...Rd4+
        • 2.Bf4#
      • 1...Rxg5+
        • 2.Rxg5#
      • 1...Qxe3
        • 2.Qxe3#
      • 1...Rf7
        • 2.Sxf7#
      • 1...Sd3
        • 2.Bxc5#
      • 1...Sg6
        • 2.Sf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(a);N_PINB(D)::QAR(B)+B(D),XP(d)
    • Q(a);CHECK,P_SPINQ(a),XB(D)::QAR2(B),XQ(a)
    • R(h);OGATE,XS(G)::R(I),XR(h)
    • R(h);N_GUARD::S(G)
    • R(h);CHECK,N_GUARD::S(G),XR(h)
    • R(h);N_GUARD,XR(I)::S(G)
  • Actual
    • K(E);N_SPINB(D),P_SPINS(G),S_FLIGHT
    • Threat
      • P(C)
    • Vars
      • R(e);CHECK,SBLOCK::QAR(B)+B(D),DCHECK
      • R(h);CHECK,OGATE,XS(G)::R(I),XR(h)
      • Q(a);OGATE,P_SPINQ(a),XB(D)::QAR2(B),XQ(a)
      • R(h);N_PINS(G)::S(G),XR(h)
      • S(c);S_CUTQ(a)::QAR(B)+B(D),XP(d)
      • S(i);N_PINS(G)::S(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).