MESON Chess Problem Database

Problem Display
PID: 225870 (1bQ1b3/r3p3/Np2R3/Np1k1n2/R7/4p1BB/K4npq/8 w - - 0 1)

Sifrin, Sene L

Praca, 1959

1bQ1b3/r3p3/Np2R3/Np1k1n2/R7/4p1BB/K4npq/8

#2

8 + 12

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rd7
      • 2.Qc6#
    • 1...Bh5
      • 2.Qc6#
    • 1...Bc6
      • 2.Qxc6#
    • 1...Bg6
      • 2.Qc6#
    • 1...Bf7
      • 2.Qc6#
    • 1...Sd4
      • 2.Sb4#
    • 1...Sd6
      • 2.Re5#
    • 1...bxa4
      • 2.Qc4#
    • 1...b4
      • 2.Qc4#
  • Tries
    • 1.Rd4+?
      • 1...Sxd4
        • 2.Sb4#
      • 1...Kxd4!
    • 1.Re5+?
      • 1...Kd6
        • 2.Qe6#
      • 1...Bxe5!
    • 1.Rd6+?
      • 1...Sxd6
        • 2.Be6#
        • 2.Qe6#
      • 1...exd6
        • 2.Qxf5#
      • 1...Bxd6!
    • 1.Qc2?
      • threat
        • 2.Qb3#
      • 1...Kxe6
        • 2.Qxf5#
      • 1...bxa4
        • 2.Qc4#
      • 1...b4
        • 2.Qc4#
      • 1...Rc7
        • 2.Qxf5#
      • 1...Sd4
        • 2.Sb4#
      • 1...Sd6
        • 2.Re5#
      • 1...Rxa6!
    • 1.Qc5+?
      • 1...Kxe6
        • 2.Qxf5#
      • 1...bxc5!
  • Keys
    • 1.Sb4+!
      • 1...Kd4
        • 2.Sb3#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 9
  • Sets
    • R(i);S_CUTB(l)::QAB1(H)
    • B(l);N_GUARD::QAB1(H)
    • B(l);N_GUARD::QAB1(H),XB(l)
    • S(g);SBLOCK::S(F)
    • S(g);SBLOCK,S_CUTB(k)::R1(G)
    • P(e);N_GUARD,XR(D)::QAB1(H)
    • P(e);N_GUARD::QAB1(H)
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • S(g);SBLOCK,XR(D)::S(F)
      • Refutation
        • K(f);P-FLIGHT,XR(D)
    • Try
      • R(G);CHECK
      • Vars
        • K(f);P-FLIGHT::QAR1(H)
      • Refutation
        • B(k);XR(G)
    • Try
      • R(G);CHECK
      • Vars
        • P(j);XR(G)::QAR2(H),XS(g)
      • Refutation
        • B(k);XR(G)
    • Try
      • Q(H);
      • Threat
        • QAB(H)
      • Vars
        • K(f);P_SPINS(g),S_FLIGHT,XR(G)::QAB1(H),XS(g)
        • P(e);N_GUARD,XR(D)::QAB1(H)
        • P(e);N_GUARD::QAB1(H)
        • R(i);S_CUTB(k)::QAR2(H),XS(g)
        • S(g);SBLOCK::S(F)
        • S(g);SBLOCK,S_CUTB(k)::R1(G)
      • Refutation
        • R(i);XS(F)
    • Try
      • Q(H);CHECK
      • Vars
        • K(f);OGATE,P_SPINS(g),S_FLIGHT,XR(G)::QAB1(H),XS(g)
      • Refutation
        • P(h);XQ(H)
  • Actual
    • S(F);CHECK
    • Vars
      • K(f);P-FLIGHT::S(E)
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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).