MESON Chess Problem Database

Problem Display
PID: 83720 (BB1n4/1r3pQK/4P1N1/P1Nkp1bR/1Pp5/2Pb3P/7q/3R4 w - - 0 1)

Ellerman, Arnoldo

Good Companions, 1921

BB1n4/1r3pQK/4P1N1/P1Nkp1bR/1Pp5/2Pb3P/7q/3R4

#2

13 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sxe6
      • 2.Bxb7#
    • 1...e4
      • 2.Se7#
    • 1...fxe6
      • 2.Qd7#
    • 1...fxg6
      • 2.Qd7#
    • 1...f5
      • 2.Qd7#
    • 1...f6
      • 2.Qd7#
  • Keys
    • 1.Qxf7!
      • threat
        • 2.Qd7#
      • 1...Kc6
        • 2.Qd7#
      • 1...Sxf7
        • 2.Bxb7#
      • 1...Be7
        • 2.Qf3#
      • 1...Sc6
        • 2.e7#
      • 1...e4
        • 2.Se7#

This is a version of 65156

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • S(i);N_GUARD,XP(H)::B(L),XR(g)
    • P(e);N_PINS(I)::S(I)
    • P(h);OGATE,P_PINQ(J),XP(H)::QAR2(J)
    • P(h);OGATE,P_PINQ(J),XS(I)::QAR2(J)
    • P(h);N_PINS(I),OGATE,P_PINQ(J)::QAR2(J)
    • P(h);OGATE,P_PINQ(J)::QAR2(J)
  • Actual
    • Q(J);P_SPINQ(J),XP(h)
    • Threat
      • QAR2(J)
    • Vars
      • K(d);N_SPINB(b),S_FLIGHT::QAB1(J)
      • S(i);N_GUARD,XQ(J)::B(L),XR(g)
      • B(f);N_PINQ(J),P_SPINP(e)::QAB(J)
      • S(i);N_GUARD,N_SPINR(g),SBLOCK::QAB(J)+P(H)
      • P(e);N_PINS(I)::S(I)
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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).