MESON Chess Problem Database

Problem Display
PID: 238123 (8/5N2/2P5/1P6/QpBnk1P1/1P2B2P/8/3K1N2 w - - 0 1)

Hermanson, Halvar

Mat, 1972

8/5N2/2P5/1P6/QpBnk1P1/1P2B2P/8/3K1N2

#2

11 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kf3
      • 2.Bd5#
  • Tries
    • 1.Sd6+?
      • 1...Kf3
        • 2.Bd5#
      • 1...Ke5!
    • 1.Qa1?
      • 1...Kf3
        • 2.Bd5#
      • 1...Sxb3
        • 2.Sg5#
      • 1...Sxb5
        • 2.Sg5#
      • 1...Sxc6
        • 2.Sg5#
      • 1...Sc2
        • 2.Sg5#
      • 1...Se2
        • 2.Sg5#
      • 1...Sf3
        • 2.Sd6#
        • 2.Qb1#
      • 1...Sf5
        • 2.Sg5#
      • 1...Se6!
    • 1.Qa7?
      • 1...Kf3
        • 2.Bd5#
      • 1...Sxb5
        • 2.Sd2#
      • 1...Sxc6
        • 2.Sd2#
      • 1...Sc2
        • 2.Sd2#
      • 1...Se2
        • 2.Sd2#
      • 1...Sf3
        • 2.Sg3#
      • 1...Sf5
        • 2.Sd2#
      • 1...Se6
        • 2.Sd2#
      • 1...Sxb3!
    • 1.c7?
      • 1...Kf3
        • 2.Bd5#
      • 1...Sxb3
        • 2.Qa8#
      • 1...Sxb5
        • 2.Qa8#
      • 1...Sc2
        • 2.Qa8#
      • 1...Se2
        • 2.Qa8#
      • 1...Sf3
        • 2.Qa8#
      • 1...Sf5
        • 2.Qa8#
      • 1...Se6
        • 2.Qa8#
      • 1...Sc6!
  • Keys
    • 1.Qa8!
      • 1...Kf3
        • 2.Bd5#
      • 1...Sxb3
        • 2.c7#
      • 1...Sxb5
        • 2.c7#
      • 1...Sxc6
        • 2.Qxc6#
      • 1...Sc2
        • 2.c7#
      • 1...Se2
        • 2.c7#
      • 1...Sf3
        • 2.c7#
      • 1...Sf5
        • 2.c7#
      • 1...Se6
        • 2.c7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • K(c);S_FLIGHT::B(G)
  • Tries
    • Try
      • S(K);CHECK
      • Vars
        • K(c);S_FLIGHT::B(G)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(F);
      • Vars
        • K(c);S_FLIGHT::B(G)
        • S(b);XP(C)::S(K)
        • S(b);XP(I)::S(K)
        • S(b);XP(J)::S(K)
        • S(b);::S(K)
      • Refutation
        • S(b);
    • Try
      • Q(F);
      • Vars
        • K(c);S_FLIGHT::B(G)
        • S(b);XP(I)::S(B)
        • S(b);XP(J)::S(B)
        • S(b);::S(B)
        • S(b);SBLOCK::S(B)
      • Refutation
        • S(b);XP(C)
    • Try
      • P(J);
      • Vars
        • K(c);S_FLIGHT::B(G)
        • S(b);N_GUARD,XP(C)::QAB(F)
        • S(b);N_GUARD,XP(I)::QAB(F)
        • S(b);N_GUARD::QAB(F)
        • S(b);N_GUARD,SBLOCK::QAB(F)
      • Refutation
        • S(b);
  • Actual
    • Q(F);
    • Vars
      • K(c);S_FLIGHT::B(G)
      • S(b);N_GUARD,XP(C)::QAB(F)+P(J)
      • S(b);N_GUARD,XP(I)::QAB(F)+P(J)
      • S(b);OGATE,P_SPINS(b),XP(J)::QAB(F),XS(b)
      • S(b);N_GUARD::QAB(F)+P(J)
      • S(b);N_GUARD,SBLOCK::QAB(F)+P(J)
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