MESON Chess Problem Database

Problem Display
PID: 103632 (4N1r1/8/q5P1/2R1N2k/p6p/K1p1B2P/Q1b3r1/8 w - - 0 1)

Lange, Hans Franz

Mitteldeutsche Nat. Ztg., 1936

4N1r1/8/q5P1/2R1N2k/p6p/K1p1B2P/Q1b3r1/8

#2

8 + 8

6490 yacpdb 2009
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qe2
      • 2.Sf6#
    • 1...Qd3
      • 2.Sf6#
    • 1...Qc4
      • 2.Sf6#
    • 1...Qb5
      • 2.Sf6#
    • 1...Qb7
      • 2.Sf6#
    • 1...Qc8
      • 2.Sf6#
    • 1...Qa5
      • 2.Sf6#
    • 1...Qf6
      • 2.Sxf6#
    • 1...Qa7
      • 2.Sf6#
    • 1...Qa8
      • 2.Sf6#
    • 1...Rg4
      • 2.hxg4#
    • 1...Rg7
      • 2.Sxg7#
    • 1...Rf8
      • 2.Sg7#
    • 1...Rh8
      • 2.Sg7#
  • Tries
    • 1.Sd3+?
      • 1...Kxg6
        • 2.Qxg8#
      • 1...Rg5!
    • 1.Sg4+?
      • 1...Kxg6
        • 2.Qxg8#
      • 1...Bf5!
  • Keys
    • 1.Qf7!
      • threat
        • 2.Qh7#
      • 1...Qxg6
        • 2.Sf6#
      • 1...R2xg6
        • 2.Sd3#
      • 1...R8xg6
        • 2.Sg7#
      • 1...Bxg6
        • 2.Sg4#
      • 1...Qb7
        • 2.Sf6#
      • 1...Qa7
        • 2.Sf6#
      • 1...Rg7
        • 2.Sxg7#
      • 1...Rh8
        • 2.Sg7#

Anticipated by 90240(1930)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 10
  • Sets
    • Q(g);N_GUARD::S(H)
    • Q(g);N_GUARD::S(H),XQ(g)
    • Q(g);N_GUARD,SBLOCK::S(H)
    • R(b);OGATE::P(D),XR(b)
    • R(h);N_GUARD::S(H),XR(h)
    • R(h);N_GUARD::S(H)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(f);S_FLIGHT,XP(G)::QAR2(A),XR(h)
      • Refutation
        • R(b);P_SPINR(b)
    • Try
      • S(F);CHECK
      • Vars
        • K(f);S_FLIGHT,XP(G)::QAR2(A),XR(h)
      • Refutation
        • B(a);P_SPINB(a)
  • Actual
    • Q(A);
    • Threat
      • QAR2(A)
    • Vars
      • Q(g);N_GUARD,P_SPINQ(g),XP(G)::S(H)
      • R(b);N_GUARD,P_SPINR(b),XP(G)::R(E)+S(F)
      • R(h);N_GUARD,P_SPINR(h),XP(G)::S(H)
      • B(a);N_GUARD,P_SPINB(a),XP(G)::R(E)+S(F)
      • Q(g);N_GUARD::S(H)
      • R(h);N_GUARD::S(H),XR(h)
      • R(h);N_GUARD::S(H)
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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).