MESON Chess Problem Database

Problem Display
PID: 71127 (8/2n1pB2/1pR1r2r/1pPq1R1p/1Pk1PQ1K/Pp3N2/1P2Pn2/2N3B1 w - - 0 1)

Neunivako, Pavel Efimovich

Somov Nasimovich, Evgeny

5th Prize, 64 Shakhmatnoe obozrenie, 1929/II

8/2n1pB2/1pR1r2r/1pPq1R1p/1Pk1PQ1K/Pp3N2/1P2Pn2/2N3B1

#2

14 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe4
      • 2.cxb6#
    • 1...Qd1
      • 2.cxb6#
    • 1...Qd2
      • 2.cxb6#
    • 1...Qd3
      • 2.cxb6#
    • 1...Qd6
      • 2.cxd6#
    • 1...Qd8
      • 2.cxb6#
    • 1...Rd6
      • 2.cxd6#
    • 1...Sd3
      • 2.Sd2#
  • Tries
    • 1.Sd2+?
      • 1...Kd4
        • 2.Bxf2#
        • 2.Qxf2#
        • 2.e3#
      • 1...Qxd2!
    • 1.Rxd5?
      • threat
        • 2.Sd2#
        • 2.Rd4#
      • 1...Sxe4
        • 2.Rd4#
      • 1...Sxd5!
    • 1.exd5+?
      • 1...Se4
        • 2.Sd2#
      • 1...Re4!
  • Keys
    • 1.Sd3!
      • threat
        • 2.Qc1#
      • 1...Qxe4
        • 2.cxb6#
      • 1...Qxd3
        • 2.cxb6#
      • 1...Rxe4
        • 2.Sde5#
      • 1...Sxd3
        • 2.Sd2#
      • 1...Sxe4
        • 2.Sd2#
      • 1...Qd4
        • 2.Sd2#
      • 1...Qe5
        • 2.Sdxe5#
      • 1...Sd1
        • 2.Sd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 5
  • Sets
    • Q(e);N_GUARD,P_PINQ(I),P_SPINQ(e),P_SPINR(h),XP(H)::R(M)+P(K),XP(g)
    • Q(e);N_GUARD,P_SPINR(h)::R(M)+P(K),XP(g)
    • Q(e);OGATE,P_SPINR(h)::R(M)+P(K),XQ(e)
    • R(h);OGATE,P_SPINQ(e)::R(M)+P(K),XR(h)
    • S(a);S_CUTQ(e)::S(F)
  • Tries
    • Try
      • S(F);CHECK
      • Refutation
        • Q(e);P_SPINR(h),XS(F)
    • Try
      • R(L);XQ(e)
      • Threat
        • DUALS(2)
      • Vars
        • S(a);P_SPINS(a),XP(H)::R1(L)
      • Refutation
        • S(j);XR(L)
    • Try
      • P(H);CHECK,XQ(e)
      • Vars
        • S(a);P_SPINS(a)::S(F)
      • Refutation
        • R(h);P_PINQ(I),P_SPINR(h)
  • Actual
    • S(A);
    • Threat
      • QAR(I)
    • Vars
      • Q(e);N_GUARD,P_PINQ(I),P_SPINQ(e),P_SPINR(h),XP(H)::R(M)+P(K),XP(g)
      • Q(e);N_GUARD,P_SPINR(h),XS(A)::R(M)+P(K),XP(g)
      • R(h);N_GUARD,P_PINQ(I),P_SPINQ(e),P_SPINR(h),XP(H)::S(A)
      • S(a);XS(A)::S(F)
      • S(a);P_SPINS(a),XP(H)::S(F)
      • Q(e);P_SPINR(h),SBLOCK::S(F)
      • Q(e);N_GUARD,P_SPINR(h)::S(A),XQ(e)
      • S(a);::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).