MESON Chess Problem Database

Problem Display
PID: 240649 (BbN1Q1n1/1rp5/b2P4/Rr1k1p2/N4K2/1P2P3/8/8 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Thema Danicum, 1983

BbN1Q1n1/1rp5/b2P4/Rr1k1p2/N4K2/1P2P3/8/8

#2

9 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rc5
      • 2.Sc3#
      • 2.Rxc5#
    • 1...cxd6
      • 2.Scb6#
    • 1...c5
      • 2.Sc3#
    • 1...c6
      • 2.Qe5#
  • Tries
    • 1.Scb6+?
      • 1...Kxd6
        • 2.Qd7#
      • 1...cxb6!
    • 1.Bxb7+?
      • 1...c6
        • 2.Bxc6#
        • 2.Qf7#
        • 2.Qe5#
        • 2.Qxg8#
      • 1...Bxb7!
    • 1.Rxb5+?
      • 1...c5
        • 2.Sc3#
        • 2.Sab6#
        • 2.Rxc5#
      • 1...Bxb5!
    • 1.Qe6+?
      • 1...Kc6
        • 2.d7#
      • 1...Kxe6!
    • 1.e4+?
      • 1...fxe4
        • 2.Qxe4#
      • 1...Kd4!
  • Keys
    • 1.Qd7!
      • threat
        • 2.dxc7#
      • 1...cxd6
        • 2.Scb6#
      • 1...Sf6
        • 2.Se7#
      • 1...c5
        • 2.Sc3#
      • 1...c6
        • 2.Qxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • P(f);N_GUARD,SBLOCK,XP(F)::S(H)
    • P(f);N_SPINR(a),P_PINP(F),P_SPINR(e),SBLOCK::S(C)
    • P(f);P_PINP(F),SBLOCK::QAR1(I)
  • Tries
    • Try
      • S(H);CHECK
      • Vars
        • K(b);N_SPINR(a),P-FLIGHT,XP(F)::QAR1(I)
      • Refutation
        • P(f);P_PINP(F),XS(H)
    • Try
      • B(G);CHECK,XR(e)
      • Refutation
        • B(d);XB(G)
    • Try
      • R(E);CHECK,P_PINR(e),XR(a)
      • Refutation
        • B(d);XR(E)
    • Try
      • Q(I);CHECK
      • Vars
        • K(b);N_SPINR(a),P_SPINR(e),S_FLIGHT::QAR(I)+P(F)
      • Refutation
        • K(b);N_SPINR(a),S_FLIGHT,XQ(I)
    • Try
      • P(B);CHECK
      • Vars
        • P(c);OGATE,XP(B)::QAB1(I),XP(c)
      • Refutation
        • K(b);N_SPINR(a),P-FLIGHT
  • Actual
    • Q(I);
    • Threat
      • QAR(I)+P(F),XP(f)
    • Vars
      • P(f);N_GUARD,P_SPINP(f),XP(F)::S(H)
      • S(h);N_GUARD::S(H)
      • P(f);N_SPINR(a),P_PINP(F),P_SPINR(e),SBLOCK::S(C)
      • P(f);P_PINP(F),SBLOCK::QAR2(I),XP(c)
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