MESON Chess Problem Database

Problem Display
PID: 92048 (8/8/4N3/3p2pB/3Pp1P1/3prk2/3B1n1K/5Q2 w - - 0 1)

Usath, Walter

Schach, 1962

8/8/4N3/3p2pB/3Pp1P1/3prk2/3B1n1K/5Q2

#2

7 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Re1
      • 2.Sxg5#
    • 1...Re2
      • 2.Sxg5#
      • 2.Qg2#
  • Tries
    • 1.Sc5?
      • 1...Kf4
        • 2.Qxf2#
      • 1...Re2
        • 2.Qg2#
      • 1...Re1!
    • 1.Sc7?
      • 1...Kf4
        • 2.Qxf2#
      • 1...Re2
        • 2.Qg2#
      • 1...Re1!
    • 1.Sg7?
      • 1...Kf4
        • 2.Qxf2#
      • 1...Re2
        • 2.Qg2#
      • 1...Re1!
    • 1.Sd8?
      • 1...Kf4
        • 2.Qxf2#
      • 1...Re2
        • 2.Qg2#
      • 1...Re1!
    • 1.Sf8?
      • 1...Kf4
        • 2.Qxf2#
      • 1...Re2
        • 2.Qg2#
      • 1...Re1!
    • 1.Bc1?
      • 1...Re1
        • 2.Sxg5#
      • 1...Re2
        • 2.Sxg5#
        • 2.Qg2#
      • 1...d2!
    • 1.Qd1+?
      • 1...Re2
        • 2.Sxg5#
      • 1...Sxd1!
  • Keys
    • 1.Sf4!
      • 1...Kxf4
        • 2.Qxf2#
      • 1...gxf4
        • 2.g5#
      • 1...Re1
        • 2.Qg2#
      • 1...Re2
        • 2.Qg2#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(c);::S(G),XP(g)
  • Tries
    • Try
      • S(G);
      • Vars
        • K(d);P-FLIGHT,P_SPINR(c)::QAR2(A),XS(a)
        • R(c);SBLOCK::QAB1(A)
      • Refutation
        • R(c);
    • Try
      • S(G);
      • Vars
        • K(d);P-FLIGHT,P_SPINR(c)::QAR2(A),XS(a)
        • R(c);SBLOCK::QAB1(A)
      • Refutation
        • R(c);
    • Try
      • S(G);
      • Vars
        • K(d);P-FLIGHT,P_SPINR(c)::QAR2(A),XS(a)
        • R(c);SBLOCK::QAB1(A)
      • Refutation
        • R(c);
    • Try
      • S(G);
      • Vars
        • K(d);P-FLIGHT,P_SPINR(c)::QAR2(A),XS(a)
        • R(c);SBLOCK::QAB1(A)
      • Refutation
        • R(c);
    • Try
      • S(G);
      • Vars
        • K(d);P-FLIGHT,P_SPINR(c)::QAR2(A),XS(a)
        • R(c);SBLOCK::QAB1(A)
      • Refutation
        • R(c);
    • Try
      • B(B);
      • Vars
        • R(c);::S(G),XP(g)
      • Refutation
        • P(b);
    • Try
      • Q(A);CHECK,N_PINS(a)
      • Vars
        • R(c);P_SPINR(c)::S(G),XP(g)
      • Refutation
        • S(a);XQ(A)
  • Actual
    • S(G);
    • Vars
      • K(d);P-FLIGHT,P_SPINR(c),XS(G)::QAR2(A),XS(a)
      • P(g);OGATE,SBLOCK,XS(G)::B(F)+P(E)
      • R(c);::QAB1(A)
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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).