MESON Chess Problem Database

Problem Display
PID: 90515 (2n1Q1b1/5P2/6R1/3pN3/2p1Pk2/r1N1n2K/3qP3/2B1b3 w - - 0 1)

Valve, Leo Erland

Die Schwalbe TT, 1952

2n1Q1b1/5P2/6R1/3pN3/2p1Pk2/r1N1n2K/3qP3/2B1b3

#2

9 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc3
      • 2.Rg4#
    • 1...Qd1
      • 2.Rg4#
    • 1...Qa2
      • 2.Rg4#
    • 1...Qb2
      • 2.Rg4#
    • 1...Qc2
      • 2.Rg4#
    • 1...Qd3
      • 2.Rg4#
    • 1...Qd4
      • 2.Rg4#
  • Tries
    • 1.Sd3+?
      • 1...Qxd3
        • 2.Rg4#
      • 1...cxd3!
    • 1.f8Q+?
      • 1...Bf7
        • 2.Qh6#
      • 1...Sf5!
  • Keys
    • 1.Sf3!
      • threat
        • 2.Qe5#
      • 1...Qxc3
        • 2.Rg4#
      • 1...Qxe2
        • 2.Rf6#
      • 1...Sd1
        • 2.Sxd5#
      • 1...Sf1
        • 2.Sxd5#
      • 1...Sc2
        • 2.Sxd5#
      • 1...Sg2
        • 2.Sxd5#
      • 1...Sg4
        • 2.Sxd5#
      • 1...Sf5
        • 2.Sxd5#
      • 1...Qd4
        • 2.Rg4#
      • 1...Se7
        • 2.Qb8#

This is a version of 17945

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 5
  • Sets
    • Q(b);P_SPINS(d),XS(C)::R1(G)
    • Q(b);P_SPINS(d)::R1(G)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • Q(b);P_SPINS(d),XS(F)::R1(G)
      • Refutation
        • P(e);XS(F)
    • Try
      • P(H);CHECK
      • Vars
        • B(i);P_SPINB(i)::QAB(H)
      • Refutation
        • S(d);P_PINS(C),P_SPINQ(b),P_SPINS(d)
  • Actual
    • S(F);
    • Threat
      • QAB1(I)
    • Vars
      • Q(b);P_SPINS(d),XS(C)::R1(G)
      • Q(b);P_SPINS(d),XP(B)::R(G)
      • S(d);N_GUARD,P_SPINQ(b)::S(C),XP(g)
      • Q(b);P_SPINS(d)::R1(G)
      • S(h);OGATE::QAB(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).