MESON Chess Problem Database

Problem Display
PID: 166181 (2B2Q2/1nB3p1/3rN1p1/1K2kqRn/6PP/2P1NPb1/6P1/1b2R3 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Stella Polaris, 1966

2B2Q2/1nB3p1/3rN1p1/1K2kqRn/6PP/2P1NPb1/6P1/1b2R3

#2

13 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Sf4
      • 2.Qxg7#
    • 1...Sa5
      • 2.Bxd6#
    • 1...Sc5
      • 2.Bxd6#
    • 1...Sd8
      • 2.Bxd6#
  • Tries
    • 1.Sc2+?
      • 1...Kd5
        • 2.Sb4#
        • 2.c4#
      • 1...Bxe1!
    • 1.Sxf5+?
      • 1...Kd5
        • 2.Se3#
        • 2.Se7#
        • 2.c4#
      • 1...Be4
        • 2.Sxg3#
        • 2.Sfd4#
        • 2.Sxd6#
        • 2.Sh6#
        • 2.Se7#
        • 2.Sfxg7#
      • 1...Bxe1!
  • Keys
    • 1.Sf4!
      • threat
        • 2.Sxg6#
      • 1...Kxf4+
        • 2.Sd5#
      • 1...Bd3+
        • 2.Sxd3#
      • 1...Qxg5
        • 2.Sc4#
      • 1...Bxf4
        • 2.Qe7#
      • 1...Sxf4
        • 2.Qxg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • S(e);N_GUARD::QAB(M),XP(i)
    • S(h);N_GUARD::B(K),XR(f)
  • Tries
    • Try
      • S(D);CHECK
      • Refutation
        • B(b);XR(A)
    • Try
      • S(D);CHECK,XQ(d)
      • Refutation
        • B(b);XR(A)
  • Actual
    • S(J);
    • Threat
      • S(J),XP(g)
    • Vars
      • K(c);CHECK,S_FLIGHT,XS(J)::S(D)
      • B(a);CHECK,N_GUARD::S(J),XB(a)
      • Q(d);N_SPINQ(d),XR(I)::R(A)+S(D),DCHECK
      • B(b);SBLOCK,XS(J)::QAR2(M)
      • S(e);N_GUARD,SBLOCK,XS(J)::QAB(M),XP(i)
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