MESON Chess Problem Database

Problem Display
PID: 240673 (3RB1n1/3K4/5p1b/2BN1Q2/4N3/Rb1k1P2/2pp4/2nrr3 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Thema Danicum, 1985

3RB1n1/3K4/5p1b/2BN1Q2/4N3/Rb1k1P2/2pp4/2nrr3

#2

9 + 10

5454 Near Snap 2021
15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ke2
      • 2.Sg3#
    • 1...Rxe4
      • 2.Qxe4#
    • 1...Se2
      • 2.Sd6#
  • Tries
    • 1.Kc7?
      • threat
        • 2.Bb5#
      • 1...Ke2
        • 2.Sg3#
      • 1...Kc4
        • 2.Sb6#
      • 1...Bf4+!
    • 1.Kc8?
      • threat
        • 2.Bb5#
      • 1...Ke2
        • 2.Sg3#
      • 1...Kc4
        • 2.Sb6#
      • 1...Se7+!
    • 1.Sec3+?
      • 1...Re4
        • 2.Qxe4#
      • 1...Kc4!
    • 1.Sg3+?
      • 1...Re4
        • 2.Qxe4#
      • 1...Kc4!
    • 1.Sd6+?
      • 1...Re4
        • 2.Qxe4#
      • 1...Ke2!
    • 1.Sb4+?
      • 1...Ke2
        • 2.Sg3#
      • 1...Kc4!
  • Keys
    • 1.Ke6!
      • threat
        • 2.Bb5#
      • 1...Rxe4+
        • 2.Qxe4#
      • 1...Ke2
        • 2.Sg3#
      • 1...Kc4
        • 2.Sb6#

Anticipated by 47234(1913)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • K(g);N_SPINB(f),S_FLIGHT::S(C)
    • R(c);OGATE,P_SPINR(c),XS(C)::QAB1(F),XR(c)
    • S(a);SBLOCK,S_CUTR(c)::QAB(F)+S(C)
  • Tries
    • Try
      • K(G);P-FLIGHT
      • Threat
        • B(I)
      • Vars
        • K(g);N_SPINB(f),S_FLIGHT::S(C)
        • K(g);N_SPINB(f),S_FLIGHT::S(E)
      • Refutation
        • B(i);CHECK
    • Try
      • K(G);S_FLIGHT
      • Threat
        • B(I)
      • Vars
        • K(g);N_SPINB(f),S_FLIGHT::S(C)
        • K(g);N_SPINB(f),S_FLIGHT::S(E)
      • Refutation
        • S(j);CHECK
    • Try
      • S(C);CHECK,N_PINB(f)
      • Vars
        • R(c);N_GUARD,P_SPINR(c)::QAB1(F),XR(c)
      • Refutation
        • K(g);S_FLIGHT
    • Try
      • S(C);CHECK
      • Vars
        • R(c);N_GUARD,P_SPINR(c)::QAB1(F),XR(c)
      • Refutation
        • K(g);N_SPINB(f),S_FLIGHT
    • Try
      • S(C);CHECK
      • Vars
        • R(c);N_GUARD,P_SPINR(c)::QAB1(F),XR(c)
      • Refutation
        • K(g);N_SPINB(f),S_FLIGHT
    • Try
      • S(E);CHECK
      • Vars
        • K(g);N_SPINB(f),S_FLIGHT::S(C)
      • Refutation
        • K(g);N_SPINB(f),S_FLIGHT
  • Actual
    • K(G);P_SPINS(C),S_FLIGHT
    • Threat
      • B(I)
    • Vars
      • R(c);CHECK,OGATE,P_PINS(E),P_SPINR(c),XS(C)::QAB1(F),XR(c)
      • K(g);N_PINS(C),N_SPINB(f),P_PINS(E),S_FLIGHT::S(C)
      • K(g);N_SPINB(f),S_FLIGHT::S(E)
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