MESON Chess Problem Database

Problem Display
PID: 92850 (6K1/8/5RP1/6Np/2N3kq/7R/5PP1/1B6 w - - 0 1)

Ahlberg, Ragnar

2nd Prize, Tidskrift for Schack (Beginners' TT), 1968

6K1/8/5RP1/6Np/2N3kq/7R/5PP1/1B6

#2

9 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg5
      • 2.f3#
  • Tries
    • 1.Sf3?
      • threat
        • 2.Se3#
        • 2.Sce5#
        • 2.Rxh4#
      • 1...Qxf2
        • 2.Sce5#
      • 1...Qxh3
        • 2.Se3#
        • 2.Sce5#
      • 1...Qg3
        • 2.Se3#
        • 2.Rxg3#
      • 1...Qg5
        • 2.Sh2#
        • 2.Rg3#
      • 1...Qxf6!
    • 1.Bf5+?
      • 1...Kf4
        • 2.Se6#
      • 1...Kxg5!
  • Keys
    • 1.Se6!
      • threat
        • 2.Se3#
        • 2.Se5#
        • 2.Bf5#
        • 2.Rf4#
        • 2.f3#
      • 1...Qxf2
        • 2.Se5#
      • 1...Qxf6
        • 2.Se3#
      • 1...Qxh3
        • 2.Rf4#
      • 1...Qg3
        • 2.Bf5#
      • 1...Qg5
        • 2.f3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • Q(b);P_PINP(H),SBLOCK,XS(F)::P(B)
  • Tries
    • Try
      • S(F);
      • Threat
        • DUALS(3)
      • Vars
        • Q(b);XP(B)::S(E)
      • Refutation
        • Q(b);XR(G)
    • Try
      • B(A);CHECK
      • Vars
        • K(a);P-FLIGHT::S(F)
      • Refutation
        • K(a);P-FLIGHT,XS(F)
  • Actual
    • S(F);
    • Threat
      • DUALS(5)
    • Vars
      • Q(b);XP(B)::S(E)
      • Q(b);XR(G)::S(E)
      • Q(b);XR(D)::R1(G)
      • Q(b);::B(A)
      • Q(b);P_PINP(H)::P(B)
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