MESON Chess Problem Database

Problem Display
PID: 117278 (8/5Q2/2Npn3/1P6/1Pq1kN1K/2Rb4/B2rp1P1/2B1R3 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Deutsche Schachzeitung, 1986

8/5Q2/2Npn3/1P6/1Pq1kN1K/2Rb4/B2rp1P1/2B1R3

#2

11 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ke3
      • 2.Rxe2#
    • 1...Rd1
      • 2.Qg6#
      • 2.Qh7#
    • 1...Rxa2
      • 2.Qg6#
      • 2.Qh7#
    • 1...Rb2
      • 2.Qg6#
      • 2.Qh7#
    • 1...Rc2
      • 2.Qg6#
      • 2.Qh7#
  • Tries
    • 1.Rxe2+?
      • 1...Rxe2
        • 2.Qg6#
        • 2.Qh7#
      • 1...Bxe2!
    • 1.Qxe6+?
      • 1...Kxf4
        • 2.Bxd2#
      • 1...Qxe6!
    • 1.Qg6+?
      • 1...Kxf4
        • 2.Bxd2#
      • 1...Ke3!
    • 1.Qf5+?
      • 1...Ke3
        • 2.Rxe2#
      • 1...Kxf5!
    • 1.Qh7+?
      • 1...Kxf4
        • 2.Bxd2#
      • 1...Ke3!
  • Keys
    • 1.Sxe2!
      • threat
        • 2.Qf3#
      • 1...Ke3+
        • 2.Sed4#
      • 1...Kd5+
        • 2.Sf4#
      • 1...Qxc6
        • 2.Qxe6#
      • 1...Sd4
        • 2.Sg3#
      • 1...Sf4
        • 2.Sg3#
      • 1...Sg5
        • 2.Sg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • K(e);P-FLIGHT,P_PINS(G),P_SPINB(c),P_SPINR(a)::R1(B),XP(b)
  • Tries
    • Try
      • R(B);CHECK,XP(b)
      • Refutation
        • B(c);XR(B)
    • Try
      • Q(K);CHECK,XS(g)
      • Vars
        • K(e);N_SPINP(b),P-FLIGHT,P_SPINR(a),XS(G)::B(A),XR(a)
      • Refutation
        • Q(d);XQ(K)
    • Try
      • Q(K);CHECK
      • Vars
        • K(e);N_SPINP(b),P-FLIGHT,P_SPINR(a),XS(G)::B(A),XR(a)
      • Refutation
        • K(e);P-FLIGHT,P_PINS(G),P_SPINB(c),P_SPINR(a)
    • Try
      • Q(K);CHECK
      • Vars
        • K(e);P-FLIGHT,P_PINS(G),P_SPINB(c),P_SPINR(a)::R1(B),XP(b)
      • Refutation
        • K(e);N_SPINP(b),P_PINS(G),S_FLIGHT,XQ(K)
    • Try
      • Q(K);CHECK
      • Vars
        • K(e);N_SPINP(b),P-FLIGHT,P_SPINR(a),XS(G)::B(A),XR(a)
      • Refutation
        • K(e);P-FLIGHT,P_PINS(G),P_SPINB(c),P_SPINR(a)
  • Actual
    • S(G);XP(b)
    • Threat
      • QAB1(K)
    • Vars
      • K(e);CHECK,P-FLIGHT,P_SPINB(c),P_SPINR(a)::R(B)+S(G)
      • K(e);CHECK,P_SPINQ(d),P_SPINS(g),S_FLIGHT::S(G)
      • Q(d);N_GUARD,XS(J)::QAR2(K),XS(g)
      • S(g);::R(B)+S(G),DCHECK
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