MESON Chess Problem Database

Problem Display
PID: 272059 (2r1q3/Q4bBp/1N1p1Pp1/2n3nr/3k1P1p/p6R/4p1P1/1BR1N2K w - - 0 1)

Ellerman, Arnoldo

The Problemist, 1957

2r1q3/Q4bBp/1N1p1Pp1/2n3nr/3k1P1p/p6R/4p1P1/1BR1N2K

#2

11 + 13

SOLUTION

  • SOUND
  • Sets
    • 1...Qe7
      • 2.fxe7#
    • 1...Bc4
      • 2.Rxc4#
    • 1...Be6
      • 2.f7#
    • 1...Sce4
      • 2.Rd3#
    • 1...Sge4
      • 2.Sc2#
    • 1...Se6
      • 2.Rc4#
  • Tries
    • 1.Qxa3?
      • threat
        • 2.Qb2#
        • 2.Qa1#
        • 2.Qc3#
      • 1...Sxh3
        • 2.Sf3#
        • 2.Qc3#
      • 1...Sd3
        • 2.Qxd3#
      • 1...Qa4
        • 2.Qb2#
        • 2.Qc3#
        • 2.Qe3#
      • 1...Qb5
        • 2.Qc3#
        • 2.Qe3#
      • 1...Qe3
        • 2.Qxe3#
      • 1...Ra8
        • 2.Qb2#
        • 2.Qc3#
      • 1...Ba2
        • 2.Qb2#
        • 2.Qc3#
      • 1...Bb3
        • 2.Qb2#
        • 2.Qa1#
      • 1...Sa4
        • 2.Qd3#
      • 1...Sce4
        • 2.Rd3#
        • 2.Qd3#
        • 2.Qe3#
      • 1...Sa6
        • 2.Qd3#
      • 1...Sce6
        • 2.Qxd6#
        • 2.Qd3#
        • 2.Qe3#
      • 1...Sb7
        • 2.Qd3#
      • 1...Sd7
        • 2.Qd3#
      • 1...Sf3
        • 2.Sxf3#
        • 2.Qc3#
      • 1...Sge4
        • 2.Sc2#
        • 2.Sf3#
        • 2.Qe3#
      • 1...Sb3!
  • Keys
    • 1.Qe7!
      • threat
        • 2.Sc2#
      • 1...Qxe7
        • 2.fxe7#
      • 1...Sxh3
        • 2.Sf3#
      • 1...Qa4
        • 2.Qe3#
      • 1...Bb3
        • 2.f7#
      • 1...Be6
        • 2.f7#
      • 1...Sb3
        • 2.Rd3#
      • 1...Sd3
        • 2.Rxd3#
      • 1...Sa4
        • 2.Rd3#
      • 1...Sce4
        • 2.Rd3#
      • 1...Sa6
        • 2.Rd3#
      • 1...Sce6
        • 2.Qxd6#
      • 1...Sb7
        • 2.Rd3#
      • 1...Sd7
        • 2.Rd3#
      • 1...Sf3
        • 2.Sxf3#
      • 1...Sge6
        • 2.Rc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 11
    • REMOVED MATES = 2
  • Sets
    • Q(m);OGATE::B(K)+P(I),XQ(m)
    • B(j);N_GUARD::R1(B),XB(j)
    • B(j);OGATE::B(K)+P(I)
    • S(e);N_GUARD,SBLOCK::R1(F)
    • S(f);SBLOCK::S(C)
    • S(f);S_CUTB(j)::R1(B)
  • Tries
    • Try
      • Q(J);XP(b)
      • Threat
        • DUALS(3)
      • Vars
        • S(e);N_GUARD::QAR1(J),XS(e)
        • Q(m);N_GUARD::QAB1(J),XQ(m)
        • S(e);N_GUARD::QAR1(J)
      • Refutation
        • S(e);
  • Actual
    • Q(J);
    • Threat
      • S(C)
    • Vars
      • Q(m);OGATE,XQ(J)::B(K)+P(I),XQ(m)
      • S(f);N_GUARD,XR(F)::S(C)
      • Q(m);N_GUARD::QAB1(J)
      • B(j);OGATE::B(K)+P(I)
      • S(e);N_GUARD::R1(F)
      • S(e);N_GUARD::R1(F),XS(e)
      • S(e);S_CUTB(j)::QAR2(J),XP(h)
      • S(f);N_GUARD::S(C),XS(f)
      • S(f);S_CUTB(j)::R1(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).