MESON Chess Problem Database

Problem Display
PID: 98180 (3K4/1b2Q1B1/5n2/8/2pp1Prb/1Bk1PR2/PpPpnN2/1r6 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Problem (Zagreb), 1951

3K4/1b2Q1B1/5n2/8/2pp1Prb/1Bk1PR2/PpPpnN2/1r6

#2

10 + 11

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rd1
      • 2.Sxd1#
    • 1...Sc1
      • 2.Sd1#
    • 1...Se4
      • 2.exd4#
    • 1...Sd5
      • 2.Se4#
    • 1...Sh5
      • 2.e4#
    • 1...Sd7
      • 2.e4#
    • 1...Sh7
      • 2.e4#
    • 1...Se8
      • 2.e4#
    • 1...Sg8
      • 2.e4#
    • 1...cxb3
      • 2.Qc5#
  • Tries
    • 1.Se4+?
      • 1...Sxe4
        • 2.exd4#
      • 1...Bxe4!
    • 1.exd4+?
      • 1...Kxd4
        • 2.Qe5#
      • 1...Bxf3!
  • Keys
    • 1.a3!
      • threat
        • 2.Qb4#
      • 1...cxb3
        • 2.Qc5#
      • 1...dxe3
        • 2.Qxe3#
      • 1...Se4
        • 2.exd4#
      • 1...Sd5
        • 2.Se4#
      • 1...Sh5
        • 2.e4#
      • 1...Sd7
        • 2.e4#
      • 1...Sh7
        • 2.e4#
      • 1...Se8
        • 2.e4#
      • 1...Sg8
        • 2.e4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • R(a);N_GUARD::S(C),XR(a)
    • S(d);S_CUTR(a)::S(C)
    • S(j);P_PINQ(H),P_SPINP(g),S_CUTB(k)::R(F)+P(E),XP(g)
    • S(j);N_GUARD,P_PINQ(H),P_SPINP(g),S_CUTB(k)::S(C)
    • S(j);P_PINQ(H),P_SPINP(g)::R(F)+P(E)
    • P(f);OGATEB,XB(D)::QAR2(H)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • S(j);P_PINQ(H),P_SPINP(g),XS(C)::R(F)+P(E),XP(g)
      • Refutation
        • B(k);XS(C)
    • Try
      • P(E);CHECK,XP(g)
      • Vars
        • K(e);P_SPINS(j),S_FLIGHT,XP(E)::QAB1(H)
      • Refutation
        • B(k);XR(F)
  • Actual
    • P(A);
    • Threat
      • QAB1(H)
    • Vars
      • P(f);OGATEB,XB(D)::QAR2(H)
      • P(g);OGATE,P_SPINP(g),P_SPINS(j),XP(E)::QAR2(H),XP(g)
      • S(j);P_PINQ(H),P_SPINP(g),S_CUTB(k)::R(F)+P(E),XP(g)
      • S(j);N_GUARD,P_PINQ(H),P_SPINP(g),S_CUTB(k)::S(C)
      • S(j);P_PINQ(H),P_SPINP(g)::R(F)+P(E)
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