MESON Chess Problem Database

Problem Display
PID: 70249 (5r2/p1p5/K1knQ2R/PnN1b3/1P6/7B/2q5/2R5 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Chess, 1950

5r2/p1p5/K1knQ2R/PnN1b3/1P6/7B/2q5/2R5

#2

8 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc5
      • 2.Rxc5#
  • Tries
    • 1.Sd3?
      • threat
        • 2.Sxe5#
      • 1...Ba1
        • 2.Qe4#
      • 1...Bb2
        • 2.Qe4#
      • 1...Bh2
        • 2.Qe4#
      • 1...Bc3
        • 2.Qc4#
        • 2.Qe4#
      • 1...Bg3
        • 2.Qe4#
      • 1...Bd4
        • 2.Qe4#
      • 1...Bf4
        • 2.Bg2#
        • 2.Qe4#
      • 1...Bf6
        • 2.Bg2#
      • 1...Bg7
        • 2.Qe4#
      • 1...Bh8
        • 2.Qe4#
      • 1...Rf5!
  • Keys
    • 1.Sd7!
      • threat
        • 2.Sxe5#
      • 1...Rf5
        • 2.Sb8#
      • 1...Ba1
        • 2.Qe4#
      • 1...Bb2
        • 2.Qe4#
      • 1...Bh2
        • 2.Qe4#
      • 1...Bc3
        • 2.Qc4#
      • 1...Bg3
        • 2.Qe4#
      • 1...Bd4
        • 2.Qe4#
      • 1...Bf4
        • 2.Bg2#
        • 2.Qe4#
      • 1...Bf6
        • 2.Bg2#
      • 1...Bg7
        • 2.Qe4#
      • 1...Bh8
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 10
    • REMOVED MATES = 1
  • Sets
    • Q(a);OGATE,P_SPINQ(a),XS(E)::R1(A),XQ(a)
  • Tries
    • Try
      • S(E);P_PINQ(a)
      • Threat
        • S(E),XB(c)
      • Vars
        • B(c);OGATE::QAB(G)
        • B(c);S_CUTR(h)::B(B)
      • Refutation
        • R(h);
  • Actual
    • S(E);P_PINQ(a)
    • Threat
      • S(E),XB(c)
    • Vars
      • R(h);N_GUARD::S(E)
      • B(c);OGATE::QAB(G)
      • B(c);N_SPINQ(a),S_CUTQ(a)::QAR2(G)
      • B(c);S_CUTR(h)::B(B)
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