MESON Chess Problem Database

Problem Display
PID: 224363 (5bBn/3Npp2/3pN2p/3p1k1P/q4p1P/5P2/pQ6/Kn6 w - - 0 1)

af Hallstrom, Edvard Johannes Gabriel

Tidskrift for Schack, 1910

5bBn/3Npp2/3pN2p/3p1k1P/q4p1P/5P2/pQ6/Kn6

#2

8 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Qc2
      • 2.Sd4#
    • 1...Qb3
      • 2.Sd4#
    • 1...Qb5
      • 2.Sd4#
    • 1...Qc6
      • 2.Sd4#
    • 1...Qa3
      • 2.Sd4#
    • 1...Qd4
      • 2.Sxd4#
    • 1...Qa5
      • 2.Sd4#
    • 1...Qa6
      • 2.Sd4#
    • 1...Qa8
      • 2.Sd4#
    • 1...Bg7
      • 2.Sxg7#
  • Tries
    • 1.Bh7+?
      • 1...Kxe6
        • 2.Sxf8#
      • 1...Sg6!
    • 1.Qc2+?
      • 1...Qxc2
        • 2.Sd4#
      • 1...Qe4
        • 2.Sd4#
      • 1...Kxe6!
    • 1.Qg2?
      • threat
        • 2.Qh3#
        • 2.Qg4#
      • 1...Qd4+
        • 2.Sxd4#
      • 1...Bg7+
        • 2.Sxg7#
      • 1...Kxe6
        • 2.Qh3#
        • 2.Qg4#
      • 1...Qxd7!
    • 1.Qh2?
      • threat
        • 2.Qh3#
      • 1...Qd4+
        • 2.Sxd4#
      • 1...Bg7+
        • 2.Sxg7#
      • 1...Kxe6
        • 2.Qh3#
      • 1...Qxd7!
  • Keys
    • 1.Qg7!
      • threat
        • 2.Qg4#
      • 1...Qd4+
        • 2.Sxd4#
      • 1...Bxg7+
        • 2.Sxg7#
      • 1...Kxe6
        • 2.Qg4#
      • 1...Qxd7
        • 2.Sd4#
      • 1...Sg6
        • 2.Qxf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • Q(c);N_GUARD::S(F)
    • Q(c);N_GUARD,P_PINQ(B)::S(F),XQ(c)
    • B(k);N_GUARD,P_PINQ(B)::S(F),XB(k)
  • Tries
    • Try
      • B(H);CHECK
      • Vars
        • K(f);S_FLIGHT,XS(F)::S(G),XB(k)
      • Refutation
        • S(l);P_SPINS(l)
    • Try
      • Q(B);CHECK
      • Vars
        • Q(c);XQ(B)::S(F)
        • Q(c);P_SPINQ(c)::S(F)
      • Refutation
        • K(f);P_SPINP(j),S_FLIGHT,XS(F)
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);CHECK,N_GUARD::S(F),XQ(c)
        • B(k);CHECK,N_GUARD::S(F),XB(k)
      • Refutation
        • Q(c);XS(G)
    • Try
      • Q(B);
      • Threat
        • QAB(B)
      • Vars
        • Q(c);CHECK,N_GUARD::S(F),XQ(c)
        • B(k);CHECK,N_GUARD::S(F),XB(k)
        • K(f);P_SPINP(j),S_FLIGHT,XS(F)::QAB(B)
      • Refutation
        • Q(c);XS(G)
  • Actual
    • Q(B);
    • Threat
      • QAB1(B)
    • Vars
      • Q(c);CHECK,N_GUARD::S(F),XQ(c)
      • B(k);CHECK,XQ(B)::S(F),XB(k)
      • K(f);P_SPINP(j),S_FLIGHT,XS(F)::QAB(B)
      • Q(c);N_GUARD,XS(G)::S(F)
      • S(l);N_GUARD::QAR2(B),XP(j)
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