MESON Chess Problem Database

Problem Display
PID: 157139 (3R2n1/1p6/1p3p1Q/R2N1B2/2Pk1b2/BP1N3K/5PnP/q7 w - - 0 1)

Ellerman, Arnoldo

El Diario, 1913

3R2n1/1p6/1p3p1Q/R2N1B2/2Pk1b2/BP1N3K/5PnP/q7

#2

12 + 8

15148 Sadier Collection 2016
23 Die Schwalbe 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qb2
      • 2.Bxb2#
    • 1...Qc3
      • 2.Sxf4#
    • 1...Qd1
      • 2.Bb2#
    • 1...Qf1
      • 2.Bb2#
    • 1...Qg1
      • 2.Bb2#
    • 1...Qh1
      • 2.Bb2#
    • 1...Se1
      • 2.Qxf4#
    • 1...Se3
      • 2.Qxf4#
    • 1...Sh4
      • 2.Qxf4#
    • 1...bxa5
      • 2.Bc5#
    • 1...b5
      • 2.Bc5#
  • Tries
    • 1.Sc3+?
      • 1...Bd6
        • 2.Se2#
        • 2.Sb5#
      • 1...Kxc3!
    • 1.Sc7+?
      • 1...Bd6
        • 2.Sb5#
      • 1...Kc3!
    • 1.Qxf6+?
      • 1...Be5
        • 2.Qxe5#
        • 2.Qxb6#
      • 1...Sxf6!
  • Keys
    • 1.Se5!
      • threat
        • 2.Sf3#
      • 1...Qc3+
        • 2.Se3#
      • 1...Kxe5
        • 2.Sxb6#
      • 1...Bxe5
        • 2.Qd2#
      • 1...fxe5
        • 2.Qxb6#
      • 1...Qd1
        • 2.Bb2#
      • 1...Se1
        • 2.Qxf4#
      • 1...Sh4
        • 2.Qxf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • Q(a);N_GUARD::B(C),XQ(a)
    • Q(a);P_PINS(E),SBLOCK::R(L)+S(I),XB(d)
    • Q(a);N_GUARD::B(C)
    • Q(a);N_GUARD,P_PINP(B)::B(C)
    • S(b);N_GUARD::QAR2(K),XB(d)
    • P(e);N_GUARD,XR(H)::B(C)
    • P(e);N_GUARD::B(C)
  • Tries
    • Try
      • S(I);CHECK
      • Refutation
        • K(c);S_FLIGHT,XS(I)
    • Try
      • S(I);CHECK
      • Vars
        • B(d);P_SPINB(d)::S(I)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(K);CHECK,XP(f)
      • Refutation
        • S(h);XQ(K)
  • Actual
    • S(E);
    • Threat
      • S(E)
    • Vars
      • Q(a);CHECK,SBLOCK::R(L)+S(I)
      • K(c);S_FLIGHT,XS(E)::R(H)+S(I),XP(e)
      • B(d);OGATE,SBLOCK,XS(E)::QAR2(K)
      • P(f);OGATE,SBLOCK,XS(E)::QAB(K),XP(e)
      • Q(a);N_GUARD::B(C)
      • S(b);N_GUARD::QAR2(K),XB(d)
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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).