MESON Chess Problem Database

Problem Display
PID: 263319 (8/2pQ4/3q1N1p/p6p/3k3K/3N1Pp1/BbPB4/7n w - - 0 1)

Zalewski, Mieczyzlaw

1st Comm., Szachy, 1974

8/2pQ4/3q1N1p/p6p/3k3K/3N1Pp1/BbPB4/7n

#2

8 + 9

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qd5
      • 2.Qxd5#
    • 1...c5
      • 2.Qxd6#
    • 1...c6
      • 2.Qxd6#
  • Tries
    • 1.Qg4+?
      • 1...Qf4
        • 2.Qxf4#
      • 1...hxg4!
    • 1.Qf5?
      • threat
        • 2.Qe4#
      • 1...Qf4+
        • 2.Qxf4#
      • 1...Qxf6+
        • 2.Qxf6#
      • 1...Qe5
        • 2.Qxe5#
      • 1...Qe7
        • 2.Qd5#
      • 1...Qd5
        • 2.Qxd5#
      • 1...Qc6
        • 2.Qe5#
      • 1...Qe6
        • 2.Qc5#
      • 1...Sf2!
  • Keys
    • 1.Sd5!
      • threat
        • 2.Be3#
      • 1...Qf4+
        • 2.S5xf4#
      • 1...Qe7+
        • 2.Sxe7#
      • 1...Qf6+
        • 2.Sxf6#
      • 1...Qxd5
        • 2.Qxd5#
      • 1...Qe5
        • 2.Qa4#
      • 1...Qe6
        • 2.Qa4#
      • 1...Bc1
        • 2.Bc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 2
  • Sets
    • Q(g);OGATE::QAR1(H),XQ(g)
    • P(i);N_GUARD::QAR2(H),XQ(g)
  • Tries
    • Try
      • Q(H);CHECK,N_PINQ(g)
      • Vars
        • Q(g);N_GUARD,P_PINQ(H),P_SPINQ(g)::QAR2(H),XQ(g)
      • Refutation
        • P(f);XQ(H)
    • Try
      • Q(H);N_PINQ(g)
      • Threat
        • QAR1(H)
      • Vars
        • Q(g);CHECK,N_GUARD::QAR2(H),XQ(g)
        • Q(g);CHECK,OGATE,XS(G)::QAB(H),XQ(g)
        • Q(g);N_GUARD::QAB1(H),XQ(g)
        • Q(g);N_GUARD,P_PINS(G)::QAR1(H)
        • Q(g);N_GUARD::QAR1(H),XQ(g)
        • Q(g);N_GUARD::QAB1(H)
      • Refutation
        • S(a);
  • Actual
    • S(G);N_PINQ(g)
    • Threat
      • B(C)
    • Vars
      • Q(g);CHECK::QAR(H)+S(G),XQ(g)
      • Q(g);OGATE,P_SPINQ(g),XS(G)::QAR1(H),XQ(g)
      • Q(g);N_GUARD::QAR(H)
      • B(b);N_GUARD::B(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).