MESON Chess Problem Database

Problem Display
PID: 239893 (4R2b/B7/q5p1/3Pn2B/2bN1k1P/R6r/P4n1P/KQ3N2 w - - 0 1)

Ellerman, Arnoldo

Parallele 50, 1947

4R2b/B7/q5p1/3Pn2B/2bN1k1P/R6r/P4n1P/KQ3N2

#2

12 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qb5
      • 2.Se6#
    • 1...Qb7
      • 2.Se6#
    • 1...Qxa3
      • 2.Se6#
    • 1...Qa4
      • 2.Se6#
    • 1...Qa5
      • 2.Se6#
    • 1...Qe6
      • 2.Sxe6#
    • 1...Qxa7
      • 2.Se6#
    • 1...Rg3
      • 2.hxg3#
    • 1...gxh5
      • 2.Qf5#
    • 1...g5
      • 2.Qf5#
  • Tries
    • 1.Qc1+?
      • 1...Re3
        • 2.Qxe3#
      • 1...Ke4!
  • Keys
    • 1.Sg3!
      • threat
        • 2.Qc1#
      • 1...Qxa3
        • 2.Se6#
      • 1...Rxg3
        • 2.hxg3#
      • 1...gxh5
        • 2.Qf5#
      • 1...Sfd3
        • 2.Sde2#
      • 1...Qa5
        • 2.Se6#
      • 1...Sd1
        • 2.Qe4#
      • 1...Se4
        • 2.Qxe4#
      • 1...Sfg4
        • 2.Qe4#
      • 1...Sed3
        • 2.Se2#
      • 1...Sf3
        • 2.Rxf3#
      • 1...Seg4
        • 2.Rf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 6
  • Sets
    • Q(f);N_GUARD::S(G)
    • Q(f);N_GUARD,P_PINP(D),XR(F)::S(G)
    • Q(f);N_GUARD::S(G),XQ(f)
    • Q(f);N_GUARD,XB(K)::S(G)
    • R(b);OGATE::P(E),XR(b)
    • P(g);N_GUARD,XB(J)::QAR1(B)
    • P(g);N_GUARD::QAR1(B)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAB1(B),XR(b)
      • Refutation
        • K(d);P-FLIGHT,P_SPINS(e)
  • Actual
    • S(C);
    • Threat
      • QAB(B)
    • Vars
      • Q(f);N_GUARD,P_PINP(D),XR(F)::S(G)
      • R(b);OGATE,XS(C)::P(E),XR(b)
      • P(g);N_GUARD,XB(J)::QAR1(B)
      • S(a);S_CUTB(c)::S(G)
      • Q(f);N_GUARD::S(G)
      • S(a);N_GUARD::QAR1(B)
      • S(a);N_GUARD::QAR1(B),XS(a)
      • S(e);P_PINS(G),S_CUTB(c)::S(C)
      • S(e);N_GUARD,P_PINS(G)::R1(F),XS(e)
      • S(e);N_GUARD,P_PINS(G)::R1(F)
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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).