MESON Chess Problem Database

Problem Display
PID: 96 (1qN5/1pN1r3/ppk1nbQ1/8/1PB3r1/4R1B1/3R4/4K3 w - - 0 1)

Adabashev, Mark Ivanovich

Shakhmatny Listok, 1930

1qN5/1pN1r3/ppk1nbQ1/8/1PB3r1/4R1B1/3R4/4K3

#2

9 + 9

5454 Near Snap 2009
15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Qa7
      • 2.Sxa7#
    • 1...Qxc7
      • 2.Sa7#
    • 1...Re4
      • 2.Qxe4#
    • 1...Rxc7
      • 2.Rd6#
      • 2.Rxe6#
    • 1...Rf7
      • 2.Rxe6#
    • 1...Rg7
      • 2.Rxe6#
    • 1...Rh7
      • 2.Rxe6#
    • 1...Re8
      • 2.Qxe8#
    • 1...Ba1
      • 2.Sxe7#
    • 1...Bb2
      • 2.Sxe7#
    • 1...Bc3
      • 2.Sxe7#
    • 1...Bg7
      • 2.Sxe7#
    • 1...Bh8
      • 2.Sxe7#
    • 1...Sc5
      • 2.Sxe7#
    • 1...Sg5
      • 2.Sxe7#
    • 1...Sxc7
      • 2.Sxe7#
      • 2.Rd6#
    • 1...Sg7
      • 2.Sxe7#
    • 1...Sd8
      • 2.Sxe7#
    • 1...Sf8
      • 2.Sxe7#
    • 1...a5
      • 2.Bb5#
  • Tries
    • 1.Qe8+?
      • 1...Rd7
        • 2.Bd5#
        • 2.Rxe6#
        • 2.Qxd7#
      • 1...Rxe8!
  • Keys
    • 1.Rc3!
      • threat
        • 2.Bb5#
      • 1...Re4+
        • 2.Qxe4#
      • 1...Sd4+
        • 2.Be6#
      • 1...Sf4+
        • 2.Be2#
      • 1...Sc5+
        • 2.Sxe7#
      • 1...Sg5+
        • 2.Sxe7#
      • 1...Sxc7+
        • 2.Sxe7#
      • 1...Sg7+
        • 2.Sxe7#
      • 1...Sd8+
        • 2.Sxe7#
      • 1...Sf8+
        • 2.Sxe7#
      • 1...Qxc7
        • 2.Sa7#
      • 1...Rxc4
        • 2.Qe4#
      • 1...Rxc7
        • 2.Rd6#
      • 1...Bxc3
        • 2.Sxe7#
      • 1...b5
        • 2.Bxb5#

This anticipates 77034(1942)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 10
  • Sets
    • Q(i);N_GUARD::S(I),XQ(i)
    • Q(i);N_GUARD,XS(H)::S(I)
    • R(a);N_GUARD,P_PINR(C)::QAB(G),XR(a)
    • R(h);N_GUARD::R(C),XS(e)
    • R(h);N_GUARD::QAB(G),XR(h)
    • B(f);N_GUARD,P_SPINS(e)::S(I),XR(h)
    • B(f);N_GUARD,P_PINR(B),P_SPINS(e)::S(I),XR(h)
    • S(e);P_PINR(C),P_SPINB(f)::S(I),XR(h)
    • P(b);N_GUARD::B(F)
  • Tries
    • Try
      • Q(G);CHECK
      • Refutation
        • R(h);XQ(G)
  • Actual
    • R(C);
    • Threat
      • R(C)+B(F),DCHECK
    • Vars
      • R(a);CHECK,N_GUARD::QAB(G),XR(a)
      • S(e);CHECK,P_SPINB(f),S_CUTR(a)::R(C)+B(F)
      • S(e);CHECK,N_GUARD,P_SPINB(f),S_CUTR(a)::R(C)+B(F)
      • S(e);CHECK,P_SPINB(f)::S(I),XR(h)
      • S(e);CHECK,P_SPINB(f),XS(H)::S(I),XR(h)
      • Q(i);N_GUARD,XS(H)::S(I)
      • R(a);N_GUARD,P_SPINR(a),XB(F)::QAB(G)
      • R(h);SBLOCK,XS(H)::R1(B)
      • B(f);N_GUARD,P_PINR(B),P_SPINS(e),XR(C)::S(I),XR(h)
      • P(c);::R(C)+B(F),DCHECK,XP(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).