MESON Chess Problem Database

Problem Display
PID: 223366 (4N3/4Q1B1/7R/3pq3/2n1k1K1/4p2P/4P3/1N6 w - - 0 1)

Joseph, Samuel M

St. Louis Globe Democrat, 1885

4N3/4Q1B1/7R/3pq3/2n1k1K1/4p2P/4P3/1N6

#2

8 + 5

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe7
      • 2.Sc3#
    • 1...Sb2
      • 2.Qxe5#
    • 1...Sd2
      • 2.Qxe5#
    • 1...Sa3
      • 2.Qxe5#
    • 1...Sa5
      • 2.Qxe5#
    • 1...Sb6
      • 2.Qxe5#
    • 1...Sd6
      • 2.Qxe5#
    • 1...d4
      • 2.Sf6#
  • Tries
    • 1.Sd6+?
      • 1...Sxd6
        • 2.Qxe5#
      • 1...Kd4!
    • 1.Bxe5?
      • threat
        • 2.Sc3#
        • 2.Sf6#
      • 1...d4
        • 2.Sf6#
      • 1...Sxe5+!
  • Keys
    • 1.Rh4!
      • 1...Qe6+
        • 2.Kg5#
      • 1...Kd4
        • 2.Kf3#
      • 1...Qxe7
        • 2.Sc3#
      • 1...Sb2
        • 2.Qxe5#
      • 1...Sd2
        • 2.Qxe5#
      • 1...Sa3
        • 2.Qxe5#
      • 1...Sa5
        • 2.Qxe5#
      • 1...Sb6
        • 2.Qxe5#
      • 1...Sd6
        • 2.Qxe5#
      • 1...d4
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(e);N_SPINQ(e),XQ(F)::S(A)
    • S(b);N_GUARD::QAR1(F),XQ(e)
    • P(d);SBLOCK::S(H)
  • Tries
    • Try
      • S(H);CHECK
      • Vars
        • S(b);XS(H)::QAR1(F),XQ(e)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • B(G);XQ(e)
      • Threat
        • DUALS(2)
      • Vars
        • P(d);::S(H)
      • Refutation
        • S(b);CHECK,P_SPINS(b),XB(G)
  • Actual
    • R(E);
    • Vars
      • Q(e);CHECK::R(E)+K(D)
      • K(c);P-FLIGHT::R(E)+K(D)
      • Q(e);N_SPINQ(e),XQ(F)::S(A)
      • S(b);N_GUARD::QAR1(F),XQ(e)
      • P(d);SBLOCK::S(H)
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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).