MESON Chess Problem Database

Problem Display
PID: 227640 (3QN3/1p4n1/1P1P1B1p/Rn4bR/4k3/1PpNp3/2p1B3/2K5 w - - 0 1)

Markus, Gustav

Reichspost, 1926

3QN3/1p4n1/1P1P1B1p/Rn4bR/4k3/1PpNp3/2p1B3/2K5

#2

11 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bf4
      • 2.Sc5#
    • 1...Sd4
      • 2.Re5#
    • 1...Sxd6
      • 2.Sxd6#
  • Tries
    • 1.Qe7+?
      • 1...Kd5
        • 2.Bf3#
      • 1...Se6
        • 2.Qxe6#
      • 1...Kf5!
    • 1.Qc8?
      • 1...Kd5
        • 2.Bf3#
        • 2.Qc4#
      • 1...Bxf6
        • 2.Qg4#
      • 1...Sxd6
        • 2.Sxd6#
      • 1...Sxh5
        • 2.Qe6#
      • 1...Sxe8
        • 2.Qe6#
      • 1...Se6
        • 2.Qxe6#
      • 1...Bf4
        • 2.Sc5#
        • 2.Qxb7#
      • 1...Bh4
        • 2.Qg4#
        • 2.Qxb7#
      • 1...Sa3
        • 2.Qxb7#
      • 1...Sd4
        • 2.Re5#
      • 1...Sa7
        • 2.Qc4#
      • 1...Sf5
        • 2.Qe6#
        • 2.Qxb7#
      • 1...Sc7!
  • Keys
    • 1.Qd7!
      • 1...Kd5
        • 2.Bf3#
      • 1...Bxf6
        • 2.Qg4#
      • 1...Sxd6
        • 2.Sxd6#
      • 1...Sxh5
        • 2.Qe6#
      • 1...Sxe8
        • 2.Qe6#
      • 1...Se6
        • 2.Qxe6#
      • 1...Bf4
        • 2.Sc5#
        • 2.Qxb7#
      • 1...Bh4
        • 2.Qg4#
        • 2.Qxb7#
      • 1...Sa3
        • 2.Qxb7#
      • 1...Sd4
        • 2.Re5#
      • 1...Sa7
        • 2.Qa4#
      • 1...Sc7
        • 2.Qa4#
      • 1...Sf5
        • 2.Qe6#
        • 2.Qxb7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 1
  • Sets
    • B(f);SBLOCK::S(D)
    • S(e);OGATE,SBLOCK::R1(E)
    • S(e);XP(H)::S(K),XS(e)
  • Tries
    • Try
      • Q(J);CHECK
      • Vars
        • K(d);P_SPINB(f),P_SPINS(e),S_FLIGHT::B(B)
        • S(i);N_GUARD,P_SPINS(i)::QAR2(J),XS(i)
      • Refutation
        • K(d);P_SPINB(f),P_SPINS(e),S_FLIGHT
    • Try
      • Q(J);
      • Vars
        • B(f);N_GUARD,XB(I)::QAR2(J)
        • S(e);XP(H)::S(K),XS(e)
        • S(i);N_GUARD,XR(F)::QAR2(J)
        • S(i);N_GUARD,XS(K)::QAR2(J)
        • S(i);N_GUARD::QAR2(J),XS(i)
        • S(e);::QAB(J),XP(h)
        • S(e);OGATE,SBLOCK::R1(E)
        • S(e);N_GUARD::QAR2(J)
      • Refutation
        • S(e);
  • Actual
    • Q(J);
    • Vars
      • K(d);P_SPINB(f),P_SPINS(e),S_FLIGHT::B(B)
      • B(f);N_GUARD,XB(I)::QAR2(J)
      • S(e);XP(H)::S(K),XS(e)
      • S(i);N_GUARD,XR(F)::QAR2(J)
      • S(i);N_GUARD,XS(K)::QAR2(J)
      • S(i);N_GUARD::QAR2(J),XS(i)
      • S(e);::QAB(J),XP(h)
      • S(e);OGATE,SBLOCK::R1(E)
      • S(e);OGATE::QAR(J)
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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).