MESON Chess Problem Database

Problem Display
PID: 235683 (3R1b2/3N4/3p4/4P1p1/R1PkN2r/KPpr3n/4Q1B1/1b6 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

3rd Prize, Norsk Sjakkblad, 1980-1981

3R1b2/3N4/3p4/4P1p1/R1PkN2r/KPpr3n/4Q1B1/1b6

#2

10 + 9

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rxe4
      • 2.Qxe4#
    • 1...dxe5+
      • 2.Sxf8#
    • 1...d5+
      • 2.c5#
  • Tries
    • 1.Sf2?
      • threat
        • 2.c5#
      • 1...c2
        • 2.Qxd3#
      • 1...Re4
        • 2.Qxe4#
      • 1...Rf3!
    • 1.Sxg5?
      • threat
        • 2.Se6#
        • 2.c5#
      • 1...dxe5+
        • 2.c5#
      • 1...d5+
        • 2.c5#
      • 1...Sxg5
        • 2.c5#
      • 1...Rf3
        • 2.Sxf3#
        • 2.Se6#
      • 1...Re4
        • 2.Se6#
        • 2.Qxe4#
      • 1...Rh6
        • 2.Qe4#
        • 2.c5#
      • 1...Sf4
        • 2.Qe4#
        • 2.c5#
      • 1...c2!
  • Keys
    • 1.Sec5!
      • threat
        • 2.Se6#
      • 1...dxc5
        • 2.Sxf8#
      • 1...dxe5
        • 2.Qxe5#
      • 1...c2
        • 2.Qxd3#
      • 1...Rh6
        • 2.Qe4#
      • 1...Sf4
        • 2.Qe4#
      • 1...d5
        • 2.cxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • R(f);OGATE,XS(G)::QAR1(A),XR(f)
    • P(h);CHECK,SBLOCK,XP(H)::R(J)+S(I),XB(i)
    • P(h);CHECK,SBLOCK::R(E)+P(F)
  • Tries
    • Try
      • S(G);
      • Threat
        • R(E)+P(F)
      • Vars
        • P(b);P_PINP(D),S_CUTB(a)::QAR1(A),XR(c)
        • R(f);N_GUARD::QAR1(A),XR(f)
      • Refutation
        • R(c);
    • Try
      • S(G);XP(g)
      • Threat
        • DUALS(2)
      • Vars
        • P(h);CHECK,XP(H)::R(E)+P(F)
        • P(h);CHECK::R(E)+P(F)
        • S(d);XS(G)::R(E)+P(F)
      • Refutation
        • P(b);P_PINP(D)
  • Actual
    • S(G);
    • Threat
      • S(G)
    • Vars
      • P(h);SBLOCK,XS(G)::R(J)+S(I),XB(i)
      • P(h);OGATE,P_PINS(G),XP(H)::QAB1(A),XP(h)
      • P(b);P_PINP(D),S_CUTB(a)::QAR1(A),XR(c)
      • R(f);N_GUARD::QAR1(A)
      • S(d);S_CUTR(f)::QAR1(A)
      • P(h);OGATE,P_PINS(G)::R(E)+P(F),XP(h)
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