MESON Chess Problem Database

Problem Display
PID: 90240 (8/4N1r1/8/q5P1/pPR1N2k/2Q2B1p/K1p4P/2b3r1 w - - 0 1)

Kofman, Rafael Moiseevich

Die Schwalbe, 1930

8/4N1r1/8/q5P1/pPR1N2k/2Q2B1p/K1p4P/2b3r1

#2

9 + 8

35 L'Italia Scacchistica 1930
6490 yacpdb 2009
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb4
      • 2.Sf5#
    • 1...Qb6
      • 2.Sf5#
    • 1...Qc7
      • 2.Sf5#
    • 1...Qd8
      • 2.Sf5#
    • 1...Qf5
      • 2.Sxf5#
    • 1...Qa6
      • 2.Sf5#
    • 1...Qa7
      • 2.Sf5#
    • 1...Qa8
      • 2.Sf5#
    • 1...Re1
      • 2.Qxe1#
    • 1...Rg3
      • 2.hxg3#
    • 1...Rg6
      • 2.Sxg6#
    • 1...Rf7
      • 2.Sg6#
    • 1...Rh7
      • 2.Sg6#
  • Tries
    • 1.Sd2+?
      • 1...Kxg5
        • 2.Qxg7#
      • 1...Rg4!
    • 1.Sg3+?
      • 1...Kxg5
        • 2.Qxg7#
      • 1...Bf4!
    • 1.Qe1+?
      • 1...Rg3
        • 2.Qxg3#
        • 2.hxg3#
      • 1...Rxe1!
  • Keys
    • 1.Qf6!
      • threat
        • 2.Qh6#
      • 1...Qxg5
        • 2.Sf5#
      • 1...R1xg5
        • 2.Sd2#
      • 1...R7xg5
        • 2.Sg6#
      • 1...Bxg5
        • 2.Sg3#
      • 1...Qb6
        • 2.Sf5#
      • 1...Qa6
        • 2.Sf5#
      • 1...Rg6
        • 2.Sxg6#
      • 1...Rh7
        • 2.Sg6#

This anticipates 103632(1936)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 9
  • Sets
    • Q(g);N_GUARD,XP(E)::S(I)
    • Q(g);N_GUARD::S(I)
    • Q(g);N_GUARD::S(I),XQ(g)
    • Q(g);N_GUARD,SBLOCK::S(I)
    • R(b);N_GUARD::QAB(C),XR(b)
    • R(b);OGATE::P(B),XR(b)
    • R(h);N_GUARD::S(I),XR(h)
    • R(h);N_GUARD::S(I)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • K(f);S_FLIGHT,XP(H)::QAR2(C),XR(h)
      • Refutation
        • R(b);P_SPINR(b)
    • Try
      • S(G);CHECK
      • Vars
        • K(f);S_FLIGHT,XP(H)::QAR2(C),XR(h)
      • Refutation
        • B(a);P_SPINB(a)
    • Try
      • Q(C);CHECK
      • Refutation
        • R(b);XQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAR2(C)
    • Vars
      • Q(g);N_GUARD,P_SPINQ(g),XP(H)::S(I)
      • R(b);N_GUARD,P_SPINR(b),XP(H)::R(F)+S(G)
      • R(h);N_GUARD,P_SPINR(h),XP(H)::S(I)
      • B(a);N_GUARD,P_SPINB(a),XP(H)::R(F)+S(G)
      • Q(g);N_GUARD::S(I)
      • R(h);N_GUARD::S(I),XR(h)
      • R(h);N_GUARD::S(I)
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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).