MESON Chess Problem Database

Problem Display
PID: 205103 (3bnqnN/2p1kP1p/1r2P3/1B2PQr1/3N3B/8/8/5K2 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

American Chess Bulletin, 1950

3bnqnN/2p1kP1p/1r2P3/1B2PQr1/3N3B/8/8/5K2

#2

9 + 9

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qh6
      • 2.fxe8Q#
      • 2.fxe8R#
      • 2.fxg8S#
    • 1...Qg7
      • 2.fxe8Q#
      • 2.fxe8R#
    • 1...Qxf7
      • 2.Qxf7#
    • 1...Rxb5
      • 2.Sc6#
    • 1...Rc6
      • 2.Sxc6#
    • 1...Rxe6
      • 2.Qxe6#
    • 1...Rb7
      • 2.Sc6#
    • 1...Rb8
      • 2.Sc6#
    • 1...h5
      • 2.Sg6#
    • 1...h6
      • 2.Sg6#
  • Keys
    • 1.Qxh7!
      • threat
        • 2.Sg6#
      • 1...Qxf7+
        • 2.Qxf7#
      • 1...Rxe6
        • 2.Sf5#
      • 1...Qh6
        • 2.fxe8Q#
        • 2.fxe8R#
      • 1...Qg7
        • 2.fxe8Q#
        • 2.fxe8R#
      • 1...Sef6
        • 2.fxg8S#
      • 1...Sgf6
        • 2.fxe8Q#
        • 2.fxe8R#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • Q(h);N_GUARD::PXS(g)=Q
    • Q(h);OGATE,P_PINQ(F),XP(H)::QAR1(F),XQ(h)
    • R(b);N_GUARD,XB(D)::S(B)
    • R(b);N_GUARD::S(B),XR(b)
    • R(b);OGATE,XP(G)::QAR1(F),XR(b)
    • R(b);N_GUARD::S(B)
    • P(e);N_GUARD::S(I)
  • Actual
    • Q(F);P_SPINP(H),XP(e)
    • Threat
      • S(I)
    • Vars
      • Q(h);CHECK,OGATE,P_SPINQ(h),XP(H)::QAR1(F),XQ(h)
      • R(b);SBLOCK,XP(G)::S(B)
      • Q(h);N_PINP(H)::PXS(g)=Q
      • S(g);N_PINP(H),N_SPINR(a)::PXS(i)=S
      • S(i);N_PINP(H),N_SPINR(a)::PXS(g)=Q
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