MESON Chess Problem Database

Problem Display
PID: 80996 (6R1/8/4B2b/2Nb3p/R1n1pk1N/1Q5p/KB6/7n w - - 0 1)

Ellerman, Arnoldo

Good Companions (May), 1920

6R1/8/4B2b/2Nb3p/R1n1pk1N/1Q5p/KB6/7n

#2

8 + 8

3391 Het Half Pin Thema 1924

SOLUTION

  • SOUND
  • Sets
    • 1...Bxe6
      • 2.Sxe6#
    • 1...Bg5
      • 2.Sg6#
    • 1...Sf2
      • 2.Qg3#
    • 1...Sg3
      • 2.Qxg3#
    • 1...Se3
      • 2.Sd3#
    • 1...Se5
      • 2.Bc1#
    • 1...h2
      • 2.Sg2#
    • 1...e3
      • 2.Qb8#
  • Tries
    • 1.Bf6?
      • threat
        • 2.Sg6#
      • 1...Bxe6
        • 2.Sxe6#
      • 1...Se3
        • 2.Sd3#
      • 1...e3
        • 2.Qb8#
      • 1...Se5!
    • 1.Rg2?
      • threat
        • 2.Sg6#
      • 1...Bxe6
        • 2.Sxe6#
      • 1...Sg3
        • 2.Qxg3#
      • 1...Se3
        • 2.Sd3#
      • 1...Se5
        • 2.Bc1#
      • 1...e3
        • 2.Qb8#
      • 1...hxg2!
  • Keys
    • 1.Rg1!
      • threat
        • 2.Sg6#
      • 1...Bxe6
        • 2.Sxe6#
      • 1...Sg3
        • 2.Qxg3#
      • 1...Se3
        • 2.Sd3#
      • 1...Se5
        • 2.Bc1#
      • 1...e3
        • 2.Qb8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 3
  • Sets
    • B(f);XB(G)::S(F),XB(f)
    • B(h);SBLOCK::S(E)
    • S(a);N_GUARD::QAB1(C)
    • S(a);N_GUARD::QAB1(C),XS(a)
    • S(c);P_PINQ(C),P_SPINP(d),SBLOCK::S(F)
    • S(c);N_GUARD,P_PINQ(C),P_SPINP(d),SBLOCK::B(B)
    • P(b);N_GUARD::S(E)
    • P(d);P_SPINS(c),SBLOCK::QAB(C)
  • Tries
    • Try
      • B(B);
      • Threat
        • S(E)
      • Vars
        • B(f);XB(G)::S(F),XB(f)
        • S(c);P_PINQ(C),P_SPINP(d),SBLOCK::S(F)
        • P(d);P_SPINS(c),SBLOCK::QAB(C)
      • Refutation
        • S(c);P_PINQ(C),P_SPINP(d)
    • Try
      • R(H);
      • Threat
        • S(E)
      • Vars
        • B(f);XB(G)::S(F),XB(f)
        • S(a);N_GUARD::QAB1(C),XS(a)
        • S(c);P_PINQ(C),P_SPINP(d),SBLOCK::S(F)
        • S(c);N_GUARD,P_PINQ(C),P_SPINP(d),SBLOCK::B(B)
        • P(d);P_SPINS(c),SBLOCK::QAB(C)
      • Refutation
        • P(b);XR(H)
  • Actual
    • R(H);
    • Threat
      • S(E)
    • Vars
      • B(f);XB(G)::S(F),XB(f)
      • S(a);N_GUARD::QAB1(C),XS(a)
      • S(c);P_PINQ(C),P_SPINP(d),SBLOCK::S(F)
      • S(c);N_GUARD,P_PINQ(C),P_SPINP(d),SBLOCK::B(B)
      • P(d);P_SPINS(c),SBLOCK::QAB(C)
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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).