MESON Chess Problem Database

Problem Display
PID: 83541 (b5Q1/5p1r/5PNb/R7/R4qk1/6Np/2rpP1nK/3B4 w - - 0 1)

Ellerman, Arnoldo

5th Prize, Good Companions (July), 1920

b5Q1/5p1r/5PNb/R7/R4qk1/6Np/2rpP1nK/3B4

#2

9 + 10

56 The Problemist 1938
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa4
      • 2.e4#
    • 1...Qb4
      • 2.e4#
    • 1...Qc4
      • 2.Qc8#
    • 1...Qd4
      • 2.e4#
    • 1...Qe4
      • 2.e3#
    • 1...Ra2
      • 2.Qc8#
    • 1...Rb2
      • 2.Qc8#
    • 1...Rc6
      • 2.e3#
    • 1...Rc8
      • 2.Qxc8#
    • 1...Bf3
      • 2.exf3#
    • 1...Sh4
      • 2.Se5#
  • Tries
    • 1.Rxf4+?
      • 1...Bxf4
        • 2.e4#
      • 1...Sxf4!
  • Keys
    • 1.Rh5!
      • threat
        • 2.Se5#
      • 1...Qxa4
        • 2.e4#
      • 1...fxg6
        • 2.Qe6#
      • 1...Qb4
        • 2.e4#
      • 1...Qc4
        • 2.Qc8#
      • 1...Qd4
        • 2.e4#
      • 1...Qe4
        • 2.e3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • Q(e);N_GUARD,N_PINS(D),N_SPINQ(e),XR(E)::B(A)+P(B)
    • Q(e);N_GUARD,N_PINS(D)::B(A)+P(B)
    • Q(e);N_PINS(D),S_CUTR(a)::QAB(I)
    • Q(e);N_PINS(D),S_CUTB(j)::B(A)+P(B)
    • R(a);N_GUARD::QAB(I)
    • R(a);S_CUTB(j)::B(A)+P(B)
    • R(a);N_GUARD::QAB(I),XR(a)
    • B(j);OGATE::P(B),XB(j)
    • S(c);SBLOCK::QAR(I)+S(H),DCHECK
  • Tries
    • Try
      • R(E);CHECK,N_SPINS(D),XQ(e)
      • Vars
        • B(g);P_PINS(D),XR(E)::B(A)+P(B)
      • Refutation
        • S(c);XR(E)
  • Actual
    • R(F);
    • Threat
      • QAR(I)+S(H),DCHECK
    • Vars
      • Q(e);N_GUARD,N_PINS(D),N_SPINQ(e),XR(E)::B(A)+P(B)
      • P(h);OGATE,P_SPINP(h),XS(H)::QAB(I)
      • Q(e);N_GUARD,N_PINS(D)::B(A)+P(B)
      • Q(e);N_PINS(D),S_CUTR(a)::QAB(I)
      • Q(e);N_PINS(D),S_CUTB(j)::B(A)+P(B)
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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).