MESON Chess Problem Database

Problem Display
PID: 180242 (K3R3/4N3/3p1p2/2PPkPP1/3ppp2/8/2B5/3Q4 w - - 0 1)

Lider, Valentin Viktorovich

4th Comm., Verdonk MT, 1977

K3R3/4N3/3p1p2/2PPkPP1/3ppp2/8/2B5/3Q4

#2

9 + 6

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...d3
      • 2.Qa1#
  • Tries
    • 1.Qh1?
      • threat
        • 2.Qxe4#
      • 1...fxg5
        • 2.Qh8#
      • 1...d3
        • 2.Qa1#
      • 1...f3
        • 2.Qh2#
      • 1...e3
        • 2.Sc6#
        • 2.Sg6#
        • 2.Sc8#
        • 2.Sg8#
        • 2.Qe4#
      • 1...dxc5!
  • Keys
    • 1.Bxe4!
      • threat
        • 2.Sc6#
        • 2.Sg6#
        • 2.Sc8#
        • 2.Sg8#
      • 1...Kxe4
        • 2.Qe2#
      • 1...dxc5
        • 2.Sc8#
      • 1...fxg5
        • 2.Sg8#
      • 1...d3
        • 2.Sc6#
      • 1...f3
        • 2.Sg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • P(a);OGATEB::QAB(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR1(A),XP(b)
      • Vars
        • P(f);OGATEB,XP(F)::QAB(A)
        • P(a);OGATEB::QAB(A)
        • P(c);OGATEB::QAB(A)
      • Refutation
        • P(e);XP(C)
  • Actual
    • B(B);XP(b)
    • Threat
      • DUALS(4)
    • Vars
      • K(d);OGATEB,P-FLIGHT,XB(B)::QAR2(A)
      • P(e);XP(C)::R(I)+S(G)
      • P(f);XP(F)::R(I)+S(G)
      • P(a);::R(I)+S(G),DCHECK
      • P(c);::R(I)+S(G),DCHECK
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