MESON Chess Problem Database

Problem Display
PID: 11667 (1B2N1R1/4Kp1n/5p1p/2p2k1P/4ppn1/4p3/7b/3BQRr1 w - - 0 1)

Zalewski, DM

1/2 Prize, Szachy, 1970

1B2N1R1/4Kp1n/5p1p/2p2k1P/4ppn1/4p3/7b/3BQRr1

#2

8 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Rxf1
      • 2.Bxg4#
    • 1...Rh1
      • 2.Bxg4#
    • 1...Rg3
      • 2.Rxf4#
    • 1...Bg3
      • 2.Bxg4#
    • 1...Se5
      • 2.Sd6#
    • 1...Sg5
      • 2.Sg7#
  • Tries
    • 1.Ba4?
      • threat
        • 2.Bd7#
      • 1...Se5
        • 2.Sd6#
      • 1...Sg5
        • 2.Sg7#
      • 1...Sf8!
    • 1.Rg5+?
      • 1...Sxg5
        • 2.Sg7#
      • 1...fxg5
        • 2.Sg7#
      • 1...hxg5
        • 2.Sg7#
      • 1...Kxg5!
    • 1.Qh4?
      • threat
        • 2.Sg7#
      • 1...Se5
        • 2.Sd6#
      • 1...Sf2!
  • Keys
    • 1.Qg3!
      • threat
        • 2.Bxg4#
        • 2.Rxf4#
      • 1...Rxf1
        • 2.Bxg4#
        • 2.Qxg4#
      • 1...Rxg3
        • 2.Rxf4#
      • 1...Bxg3
        • 2.Bxg4#
      • 1...Sf2
        • 2.Sg7#
      • 1...Se5
        • 2.Sd6#
        • 2.Sg7#
        • 2.Rxf4#
      • 1...e2
        • 2.Rxf4#
      • 1...f3
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • R(a);N_GUARD,N_SPINP(e),XR(C)::B(A),XS(f)
    • R(a);N_GUARD::B(A),XS(f)
    • R(a);S_CUTB(b)::R1(C),XP(e)
    • B(b);S_CUTR(a)::B(A),XS(f)
    • S(f);SBLOCK::S(G)
    • S(l);SBLOCK::S(G)
  • Tries
    • Try
      • B(A);
      • Threat
        • B(A)
      • Vars
        • S(f);SBLOCK::S(G)
        • S(l);SBLOCK::S(G)
      • Refutation
        • S(l);
    • Try
      • R(H);CHECK
      • Vars
        • S(l);SBLOCK,XR(H)::S(G)
        • P(i);SBLOCK,XR(H)::S(G)
        • P(j);SBLOCK,XR(H)::S(G)
      • Refutation
        • K(h);N_SPINP(e),P-FLIGHT,XR(H)
    • Try
      • Q(B);
      • Threat
        • S(G)
      • Vars
        • S(f);SBLOCK::S(G)
      • Refutation
        • S(f);N_SPINP(e)
  • Actual
    • Q(B);
    • Threat
      • DUALS(2)
    • Vars
      • R(a);XQ(B)::R1(C),XP(e)
      • B(b);XQ(B)::B(A),XS(f)
      • S(f);N_SPINP(e)::S(G)
      • P(c);::R1(C),XP(e)
      • P(e);::S(G)
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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).