MESON Chess Problem Database

Problem Display
PID: 95173 (1B6/8/3rPp2/1P1RNp1Q/1K1pk3/6p1/2pPn3/5B1b w - - 0 1)

Draiska, Imants

Pravda Vostoka, 1954

1B6/8/3rPp2/1P1RNp1Q/1K1pk3/6p1/2pPn3/5B1b

#2

9 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kf4
      • 2.Qh4#
    • 1...Bf3
      • 2.Qxf3#
    • 1...g2
      • 2.Qf3#
  • Tries
    • 1.Sd3?
      • threat
        • 2.Qxf5#
      • 1...Kxd3
        • 2.Qxe2#
      • 1...Kxd5
        • 2.Qxf5#
      • 1...Rxd5
        • 2.Qxe2#
      • 1...f4
        • 2.Sc5#
      • 1...Sf4!
    • 1.Bg2+?
      • 1...Kf4
        • 2.Sd3#
        • 2.Sg6#
        • 2.Qh4#
        • 2.Qh6#
      • 1...Bxg2!
    • 1.Qxh1+?
      • 1...Kf4
        • 2.Qh4#
      • 1...g2!
    • 1.Qxf5+?
      • 1...Kxd5
        • 2.Sd3#
        • 2.Sf3#
        • 2.Sc4#
        • 2.Sg4#
        • 2.Sc6#
        • 2.Sg6#
        • 2.Sd7#
        • 2.Sf7#
      • 1...Kxf5!
  • Keys
    • 1.Sd7!
      • threat
        • 2.Qxf5#
      • 1...Kd3
        • 2.Qxe2#
      • 1...Kf4
        • 2.Qxf5#
      • 1...Kxd5
        • 2.Qxf5#
      • 1...Rxd5
        • 2.Qxe2#
      • 1...Sf4
        • 2.Sxf6#
      • 1...f4
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • K(f);P-FLIGHT::QAR2(G)
    • B(a);N_GUARD::QAB1(G),XB(a)
    • P(d);S_CUTB(a)::QAB1(G)
  • Tries
    • Try
      • S(F);
      • Threat
        • QAB1(G),XP(g)
      • Vars
        • K(f);P_SPINP(e),P_SPINS(c),S_FLIGHT,XS(F)::QAB1(G),XS(c)
        • K(f);P_SPINP(g),S_FLIGHT,XR(E)::QAR2(G),XP(g)
        • R(h);SBLOCK,XR(E)::QAR2(G),XS(c)
        • P(g);SBLOCK::S(F)
      • Refutation
        • S(c);
    • Try
      • B(A);CHECK
      • Refutation
        • B(a);XB(A)
    • Try
      • Q(G);CHECK,XB(a)
      • Vars
        • K(f);P-FLIGHT::QAR2(G)
      • Refutation
        • P(d);P_SPINP(d)
    • Try
      • Q(G);CHECK,XP(g)
      • Refutation
        • K(f);S_FLIGHT,XQ(G)
  • Actual
    • S(F);
    • Threat
      • QAB1(G),XP(g)
    • Vars
      • K(f);P_SPINP(e),P_SPINS(c),S_FLIGHT::QAB1(G),XS(c)
      • K(f);P-FLIGHT,P_SPINR(h)::QAR1(G),XP(g)
      • K(f);P_SPINP(g),S_FLIGHT,XR(E)::QAR2(G),XP(g)
      • R(h);SBLOCK,XR(E)::QAR2(G),XS(c)
      • S(c);SBLOCK::S(F),XP(i)
      • P(g);SBLOCK::S(F)
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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).