MESON Chess Problem Database

Problem Display
PID: 150594 (NBB5/q1RK4/P7/3k4/3p4/1P1N1P2/8/8 w - - 0 1)

Akerblom, Johan Axel

Schackvarlden, 1942

NBB5/q1RK4/P7/3k4/3p4/1P1N1P2/8/8

#2

9 + 3

15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Qc5
      • 2.Rxc5#
    • 1...Qb6
      • 2.Sxb6#
    • 1...Qxb8
      • 2.Rc5#
    • 1...Qxa6
      • 2.Rc5#
    • 1...Qb7
      • 2.Bxb7#
    • 1...Qxc7+
      • 2.Sxc7#
    • 1...Qxa8
      • 2.Rc5#
  • Tries
    • 1.Ke7?
      • threat
        • 2.Be6#
      • 1...Qc5+
        • 2.Rxc5#
      • 1...Qxa6
        • 2.Rc5#
      • 1...Qb6
        • 2.Sxb6#
      • 1...Qxc7+!
    • 1.b4?
      • 1...Qxb8
        • 2.Rc5#
      • 1...Qxa6
        • 2.Rc5#
      • 1...Qxa8
        • 2.Rc5#
      • 1...Qc5
        • 2.Rxc5#
      • 1...Qb6
        • 2.Sxb6#
      • 1...Qb7
        • 2.Bxb7#
      • 1...Qxc7+!
  • Keys
    • 1.Rb7!
      • threat
        • 2.Sc7#
      • 1...Qxb7+
        • 2.Bxb7#
      • 1...Qxb8
        • 2.Sb6#
      • 1...Qxa8
        • 2.Rb5#
      • 1...Qc5
        • 2.Sf4#
      • 1...Qb6
        • 2.Sxb6#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 2
  • Sets
    • Q(c);N_PINR(E)::R1(E),XQ(c)
    • Q(c);N_GUARD,N_PINR(E)::S(G),XQ(c)
    • Q(c);N_PINR(E),XB(H)::R1(E)
    • Q(c);N_PINR(E),XP(D)::R1(E)
    • Q(c);N_GUARD::B(I),XQ(c)
    • Q(c);CHECK,XR(E)::S(G),XQ(c)
    • Q(c);N_PINR(E),XS(G)::R1(E)
  • Tries
    • Try
      • K(F);P-FLIGHT
      • Threat
        • B(I)
      • Vars
        • Q(c);CHECK,N_PINR(E)::R1(E),XQ(c)
        • Q(c);N_PINR(E),XP(D)::R1(E)
        • Q(c);N_GUARD,N_PINR(E)::S(G),XQ(c)
      • Refutation
        • Q(c);CHECK,XR(E)
    • Try
      • P(A);
      • Vars
        • Q(c);N_PINR(E),XB(H)::R1(E)
        • Q(c);N_PINR(E),XP(D)::R1(E)
        • Q(c);N_PINR(E),XS(G)::R1(E)
        • Q(c);N_PINR(E)::R1(E),XQ(c)
        • Q(c);N_GUARD,N_PINR(E)::S(G),XQ(c)
        • Q(c);N_GUARD::B(I),XQ(c)
      • Refutation
        • Q(c);CHECK,XR(E)
  • Actual
    • R(E);
    • Threat
      • S(G)
    • Vars
      • Q(c);CHECK,OGATE,XR(E)::B(I),XQ(c)
      • Q(c);N_GUARD,N_PINR(E),XB(H)::S(G)
      • Q(c);N_PINR(E),XS(G)::R(E)
      • Q(c);N_PINR(E),SBLOCK::S(B)
      • Q(c);N_GUARD,N_PINR(E)::S(G),XQ(c)
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