MESON Chess Problem Database

Problem Display
PID: 6461 (Q7/4P1P1/4PBp1/2RB1kr1/qR4N1/pPPPP3/K3Nnrn/7b w - - 0 1)

Larsen, Karl Adolf Koefoed

3rd Prize, Skakbladet JT, 1928-1929

Q7/4P1P1/4PBp1/2RB1kr1/qR4N1/pPPPP3/K3Nnrn/7b

#2

15 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb3+
      • 2.Bxb3#
    • 1...Qb5
      • 2.Rf4#
    • 1...Qc6
      • 2.Rf4#
    • 1...Qd7
      • 2.Rf4#
    • 1...Qe8
      • 2.Rf4#
    • 1...Qa5
      • 2.Rf4#
    • 1...Qa6
      • 2.Rf4#
    • 1...Qa7
      • 2.Rf4#
    • 1...Qxa8
      • 2.Rf4#
    • 1...Rg3
      • 2.Sxg3#
  • Tries
    • 1.e8S?
      • threat
        • 2.Sh6#
        • 2.Sd6#
      • 1...Qxb3+
        • 2.Bxb3#
      • 1...Qxe8
        • 2.Rf4#
      • 1...Qxb4
        • 2.Sh6#
      • 1...R5xg4
        • 2.Bc4#
      • 1...Sfxg4
        • 2.e4#
      • 1...Shxg4
        • 2.Sd4#
      • 1...Se4
        • 2.Sh6#
      • 1...Qc6
        • 2.Sh6#
        • 2.Rf4#
      • 1...Qd7
        • 2.Sh6#
        • 2.Rf4#
      • 1...Qa6
        • 2.Sh6#
        • 2.Rf4#
      • 1...Rh5
        • 2.Sd6#
      • 1...R2xg4!
  • Keys
    • 1.Qf8!
      • threat
        • 2.Sh6#
        • 2.Be5#
      • 1...Qxb3+
        • 2.Bxb3#
      • 1...Qxb4
        • 2.Sh6#
      • 1...R2xg4
        • 2.Bd4#
      • 1...R5xg4
        • 2.Bc4#
      • 1...Sfxg4
        • 2.e4#
      • 1...Shxg4
        • 2.Sd4#
      • 1...Se4
        • 2.Sh6#
      • 1...Qe8
        • 2.Sh6#
        • 2.Rf4#
      • 1...Qa8
        • 2.Sh6#
        • 2.Rf4#
      • 1...Rh5
        • 2.Bh4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 9
  • Sets
    • Q(f);CHECK,OGATE,XP(C)::R(I)+B(J),XQ(f)
    • Q(f);N_GUARD::R1(G)
    • Q(f);N_GUARD,XQ(O)::R1(G)
    • R(c);N_GUARD::S(B),XR(c)
  • Tries
    • Try
      • P(M);
      • Threat
        • DUALS(2)
      • Vars
        • Q(f);CHECK,OGATE,XP(C)::R(I)+B(J),XQ(f)
        • Q(f);N_GUARD,XS(M)::R1(G)
        • Q(f);XR(G)::S(H)
        • R(h);SBLOCK,XS(H)::R(I)+B(J)
        • S(b);N_GUARD,P_PINS(B),SBLOCK,XS(H)::P(F)
        • S(d);SBLOCK,XS(H)::S(B)
        • S(b);P_PINS(B)::S(H)
        • R(h);::S(M)
      • Refutation
        • R(c);XS(H)
  • Actual
    • Q(O);
    • Threat
      • DUALS(2)
    • Vars
      • Q(f);CHECK,OGATE,XP(C)::R(I)+B(J),XQ(f)
      • Q(f);XR(G)::S(H)
      • R(c);SBLOCK,XS(H)::QAR(O)+B(L)
      • R(h);SBLOCK,XS(H)::R(I)+B(J)
      • S(b);N_GUARD,P_PINS(B),SBLOCK,XS(H)::P(F)
      • S(d);SBLOCK,XS(H)::S(B)
      • S(b);P_PINS(B)::S(H)
      • R(h);OGATE::QAR(O)+B(L)
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