MESON Chess Problem Database

Problem Display
PID: 233944 (4Rq2/1N3p1N/1Q4r1/r3pnP1/p3k1P1/2P1Pp2/B1KP1n2/4R3 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Skakbladet, 1947

4Rq2/1N3p1N/1Q4r1/r3pnP1/p3k1P1/2P1Pp2/B1KP1n2/4R3

#2

12 + 10

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rxg5
      • 2.Sxg5#
      • 2.Sf6#
    • 1...Rf6
      • 2.Sxf6#
    • 1...Rg7
      • 2.Sf6#
    • 1...Rg8
      • 2.Sf6#
    • 1...Sd1
      • 2.d3#
    • 1...Sh1
      • 2.d3#
    • 1...Sh3
      • 2.d3#
    • 1...Sxg4
      • 2.d3#
    • 1...Sxe3+
      • 2.Qxe3#
    • 1...Sg3
      • 2.Qd4#
    • 1...Sd4+
      • 2.Qxd4#
    • 1...Sh4
      • 2.Qd4#
    • 1...Sd6
      • 2.Qd4#
    • 1...Sh6
      • 2.Qd4#
    • 1...Se7
      • 2.Qb4#
    • 1...Sg7
      • 2.Qd4#
  • Tries
    • 1.Qb4+?
      • 1...Sd4+
        • 2.Qxd4#
      • 1...Qxb4!
    • 1.Qc6+?
      • 1...Rd5
        • 2.Bxd5#
        • 2.Qxd5#
      • 1...Rxc6!
    • 1.Qxg6?
      • threat
        • 2.Sf6#
        • 2.Qxf5#
      • 1...Sxg4
        • 2.d3#
      • 1...Qd6
        • 2.Sxd6#
        • 2.Qxf5#
      • 1...Qe7
        • 2.Qxf5#
      • 1...Qg7
        • 2.Sd6#
        • 2.Qxf5#
      • 1...Qh8
        • 2.Sd6#
        • 2.Qxf5#
      • 1...Ra6
        • 2.Qxf5#
      • 1...f6
        • 2.Qxf5#
      • 1...fxg6!
  • Keys
    • 1.Qf6!
      • threat
        • 2.Qxf5#
      • 1...Sxe3+
        • 2.Rxe3#
      • 1...Sd4+
        • 2.exd4#
      • 1...Rxg5
        • 2.Sxg5#
      • 1...Rxf6
        • 2.Sxf6#
      • 1...Sxg4
        • 2.d3#
      • 1...Sg3
        • 2.Qf4#
      • 1...Sh4
        • 2.Qf4#
      • 1...Sd6
        • 2.Qf4#
      • 1...Sh6
        • 2.Qf4#
      • 1...Se7
        • 2.Sd6#
      • 1...Sg7
        • 2.Qf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 8
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • R(h);N_GUARD::S(K),XR(h)
    • R(h);N_GUARD::S(K)
    • S(a);N_GUARD::P(D)
    • S(a);N_GUARD,XP(G)::P(D)
    • S(g);CHECK,OGATE,P_SPINS(g),XP(F)::QAR1(I),XS(g)
    • S(g);N_GUARD::QAR1(I)
    • S(g);CHECK,N_GUARD::QAR1(I),XS(g)
    • S(g);N_GUARD,N_SPINP(f),S_CUTQ(j)::QAR(I)
  • Tries
    • Try
      • Q(I);CHECK
      • Vars
        • S(g);CHECK,N_GUARD,P_SPINS(g)::QAR1(I),XS(g)
      • Refutation
        • Q(j);XQ(I)
    • Try
      • Q(I);CHECK
      • Refutation
        • R(h);P_PINP(E),XQ(I)
    • Try
      • Q(I);P_PINS(g),XR(h)
      • Threat
        • DUALS(2)
      • Vars
        • S(a);N_GUARD,XP(G)::P(D)
        • Q(j);N_SPINP(f)::QAB1(I),XS(g)
        • R(e);::QAB1(I),XS(g)
        • P(i);::QAB1(I),XS(g)
      • Refutation
        • P(i);N_SPINS(g),XQ(I)
  • Actual
    • Q(I);
    • Threat
      • QAB1(I),XS(g)
    • Vars
      • S(g);CHECK,OGATE,P_SPINS(g),XP(F)::R1(A),XS(g)
      • S(g);CHECK,OGATE::R(A)+P(F),XS(g)
      • R(h);XP(H)::S(K),XR(h)
      • R(h);XQ(I)::S(K),XR(h)
      • S(a);N_GUARD,XP(G)::P(D)
      • S(g);OGATE::QAR1(I)
      • S(g);N_GUARD,N_SPINP(f),S_CUTQ(j)::S(J)
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