MESON Chess Problem Database

Problem Display
PID: 159209 (5r2/5n1b/r3p3/5k2/Rb2N3/2Nqp1QK/5PP1/1BB2R2 w - - 0 1)

Ahs, Carl Johan Mathias

Norsk Sjakkblad, 1934

5r2/5n1b/r3p3/5k2/Rb2N3/2Nqp1QK/5PP1/1BB2R2

#2

10 + 9

15148 Sadier Collection 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb1
      • 2.fxe3#
    • 1...Qxe4
      • 2.fxe3#
    • 1...Qxc3
      • 2.fxe3#
    • 1...Qd4
      • 2.fxe3#
    • 1...Qd5
      • 2.fxe3#
    • 1...Qd7
      • 2.fxe3#
    • 1...Qd8
      • 2.fxe3#
    • 1...Se5
      • 2.Qg5#
    • 1...Sg5+
      • 2.Qxg5#
    • 1...Sd6
      • 2.Qg5#
    • 1...Sh6
      • 2.Qg5#
    • 1...Sd8
      • 2.Qg5#
    • 1...Sh8
      • 2.Qg5#
    • 1...e5
      • 2.Qg4#
  • Tries
    • 1.Qf3+?
      • 1...Ke5
        • 2.Qf6#
      • 1...Kg6!
  • Keys
    • 1.Qg7!
      • threat
        • 2.Qf6#
      • 1...Sg5+
        • 2.Qxg5#
      • 1...exf2+
        • 2.Sg3#
      • 1...e2+
        • 2.Sg3#
      • 1...Kf4
        • 2.fxe3#
      • 1...Qxe4
        • 2.fxe3#
      • 1...Qxc3
        • 2.fxe3#
      • 1...Bxc3
        • 2.Sg3#
      • 1...e5
        • 2.Qg4#
      • 1...Qd4
        • 2.fxe3#
      • 1...Qd8
        • 2.fxe3#
      • 1...Be7
        • 2.Sg3#
      • 1...Se5
        • 2.Qg5#
      • 1...Sd6
        • 2.Qg5#
      • 1...Sh6
        • 2.Qg5#
      • 1...Sd8
        • 2.Qg5#
      • 1...Sh8
        • 2.Qg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • Q(a);N_GUARD,XB(A)::R(C)+P(D),XP(b)
    • Q(a);N_GUARD,P_SPINQ(a),XS(J)::R(C)+P(D),XP(b)
    • Q(a);N_GUARD,XS(F)::R(C)+P(D),XP(b)
    • Q(a);N_GUARD::R(C)+P(D),XP(b)
    • S(g);N_GUARD,SBLOCK::QAR1(G)
    • S(g);CHECK,N_GUARD::QAR1(G),XS(g)
    • S(g);N_GUARD::QAR1(G)
    • P(f);SBLOCK::QAB1(G)
  • Tries
    • Try
      • Q(G);CHECK
      • Vars
        • K(d);OGATE,P-FLIGHT::QAB1(G)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • Q(G);
    • Threat
      • QAR1(G)
    • Vars
      • S(g);CHECK,N_GUARD::QAR1(G),XS(g)
      • P(b);CHECK,P_SPINP(b),XP(D)::S(J)
      • P(b);CHECK::S(J)
      • K(d);P-FLIGHT,P_SPINP(b)::R(C)+P(D)DCHECK,XP(b)
      • Q(a);N_GUARD,P_SPINQ(a),XS(J)::R(C)+P(D),XP(b)
      • Q(a);N_GUARD,XS(F)::R(C)+P(D),XP(b)
      • B(c);XS(F)::S(J)
      • P(f);SBLOCK::QAB1(G)
      • Q(a);N_GUARD::R(C)+P(D),XP(b)
      • B(c);::S(J)
      • S(g);N_GUARD,SBLOCK::QAR1(G)
      • S(g);N_GUARD::QAR1(G)
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