MESON Chess Problem Database

Problem Display
PID: 228730 (2K5/3p3b/p3N3/2p4n/2Q1p3/rp1q4/R1P1k1P1/n1BN3R w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Deutsche Schachzeitung, 1983

2K5/3p3b/p3N3/2p4n/2Q1p3/rp1q4/R1P1k1P1/n1BN3R

#2

9 + 11

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sg3
      • 2.Sf4#
    • 1...Sf4
      • 2.Sxf4#
    • 1...Sf6
      • 2.Sf4#
    • 1...Sg7
      • 2.Sf4#
    • 1...e3
      • 2.Qg4#
  • Tries
    • 1.Qc3?
      • threat
        • 2.Re1#
        • 2.Qe1#
      • 1...Qxc2
        • 2.Re1#
        • 2.Qe3#
        • 2.Qc4#
      • 1...Qxd1
        • 2.Qe3#
      • 1...Qd2
        • 2.Qxd2#
      • 1...Qg3
        • 2.Qd2#
      • 1...Qxc3!
    • 1.cxb3+?
      • 1...Sc2
        • 2.Rxc2#
      • 1...Rxa2!
  • Keys
    • 1.Qxc5!
      • threat
        • 2.Qf2#
      • 1...Qxc2
        • 2.Qc4#
      • 1...Qxd1
        • 2.Qe3#
      • 1...Qc4
        • 2.Qxc4#
      • 1...Qc3
        • 2.Sxc3#
      • 1...Qe3
        • 2.Qxe3#
      • 1...Qf3
        • 2.Sd4#
      • 1...Qg3
        • 2.Sd4#
      • 1...Qd4
        • 2.Sxd4#
        • 2.Qxh5#
      • 1...e3
        • 2.Qxh5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 7
    • REMOVED MATES = 4
  • Sets
    • S(h);N_GUARD::S(H)
    • S(h);N_GUARD::S(H),XS(h)
    • P(f);OGATE::QAB(G)
  • Tries
    • Try
      • Q(G);N_PINQ(e)
      • Threat
        • DUALS(2)
      • Vars
        • Q(e);OGATE,XS(B)::QAR1(G)
        • Q(e);N_GUARD::QAR1(G),XQ(e)
        • Q(e);N_GUARD::QAR1(G)
      • Refutation
        • Q(e);XQ(G)
    • Try
      • P(E);CHECK,XP(d)
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::R(D),XS(a)
      • Refutation
        • R(c);XR(D)
  • Actual
    • Q(G);N_PINQ(e),XP(g)
    • Threat
      • QAR1(G)
    • Vars
      • Q(e);OGATEB,P_PINQ(G),P_SPINQ(e),XP(E)::QAB(G)
      • Q(e);N_GUARD,XS(B)::QAR1(G)
      • Q(e);OGATEB,P_PINQ(G)::QAB(G),XQ(e)
      • Q(e);N_GUARD,P_PINQ(G)::S(B),XQ(e)
      • Q(e);N_GUARD::QAR1(G),XQ(e)
      • Q(e);N_GUARD::S(H)
      • P(f);S_CUTQ(e)::QAB(G),XS(h)
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