MESON Chess Problem Database

Problem Display
PID: 159149 (5Q2/8/q6n/2P1P3/2R1pp1N/r3k2b/1bPN2R1/rn2BK2 w - - 0 1)

Ahs, Carl Johan Mathias

Skakbladet, 1934

5Q2/8/q6n/2P1P3/2R1pp1N/r3k2b/1bPN2R1/rn2BK2

#2

10 + 10

15148 Sadier Collection 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Qc8
      • 2.Rxe4#
    • 1...Qa5
      • 2.Rxe4#
    • 1...Qb6
      • 2.Rxe4#
    • 1...Qd6
      • 2.Rxe4#
    • 1...Qe6
      • 2.Rxe4#
    • 1...Qf6
      • 2.Rxe4#
    • 1...Qa7
      • 2.Rxe4#
    • 1...Rd3
      • 2.Rxe4#
    • 1...Bxg2+
      • 2.Sxg2#
    • 1...Bf5
      • 2.Re2#
    • 1...Be6
      • 2.Re2#
    • 1...Bd7
      • 2.Re2#
    • 1...Bc8
      • 2.Re2#
    • 1...Sg4
      • 2.Sf5#
  • Tries
    • 1.Sf5+?
      • 1...Bxf5
        • 2.Re2#
      • 1...Sxf5!
    • 1.Qd6?
      • threat
        • 2.Bf2#
      • 1...Qxc4+
        • 2.Sxc4#
      • 1...Bxg2+
        • 2.Sxg2#
      • 1...Sxd2+
        • 2.Qxd2#
      • 1...Qxd6
        • 2.Rxe4#
      • 1...Rd3
        • 2.Rxe4#
      • 1...Bd4
        • 2.Qxd4#
      • 1...Sc3
        • 2.Qd4#
      • 1...Sg4
        • 2.Sf5#
      • 1...f3!
  • Keys
    • 1.Qd8!
      • threat
        • 2.Bf2#
      • 1...Qxc4+
        • 2.Sxc4#
      • 1...Bxg2+
        • 2.Sxg2#
      • 1...Sxd2+
        • 2.Qxd2#
      • 1...f3
        • 2.Qg5#
      • 1...Qd6
        • 2.Rxe4#
      • 1...Rd3
        • 2.Rxe4#
      • 1...Bd4
        • 2.Qxd4#
      • 1...Bd7
        • 2.Re2#
      • 1...Sc3
        • 2.Qd4#
      • 1...Sg4
        • 2.Sf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 9
  • Sets
    • Q(i);OGATE::R1(F),XP(g)
    • R(d);OGATE::R1(F),XP(g)
    • B(f);CHECK,P_PINR(F),XR(E)::S(G),XB(f)
    • B(f);N_PINR(E),P_PINR(F)::R1(E)
    • S(j);N_GUARD,S_CUTB(f)::S(G)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • B(f);N_PINR(E),P_PINR(F),XS(G)::R1(E)
      • Refutation
        • S(j);XS(G)
    • Try
      • Q(J);
      • Threat
        • B(A)
      • Vars
        • Q(i);CHECK,XR(F)::S(D),XQ(i)
        • B(f);CHECK,P_PINR(F),XR(E)::S(G),XB(f)
        • S(b);CHECK,OGATE,P_PINB(A),XS(D)::QAB1(J),XS(b)
        • Q(i);OGATE,XQ(J)::R1(F),XP(g)
        • R(d);OGATE::R1(F),XP(g)
        • B(c);N_GUARD::QAB1(J),XB(c)
        • S(b);P_PINB(A),S_CUTB(c)::QAB1(J)
        • S(j);N_GUARD,S_CUTB(f)::S(G)
      • Refutation
        • P(h);
  • Actual
    • Q(J);
    • Threat
      • B(A)
    • Vars
      • Q(i);CHECK,XR(F)::S(D),XQ(i)
      • B(f);CHECK,P_PINR(F),XR(E)::S(G),XB(f)
      • S(b);CHECK,OGATE,P_PINB(A),XS(D)::QAB1(J),XS(b)
      • P(h);OGATEB::QAB(J)
      • Q(i);OGATE::R1(F),XP(g)
      • R(d);OGATE::R1(F),XP(g)
      • B(c);N_GUARD::QAB1(J),XB(c)
      • B(f);N_PINR(E),P_PINR(F)::R1(E)
      • S(b);P_PINB(A),S_CUTB(c)::QAB1(J)
      • S(j);N_GUARD,S_CUTB(f)::S(G)
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