MESON Chess Problem Database

Problem Display
PID: 151408 (5nr1/1K1pBP1r/5R1p/6kp/8/8/5Nn1/6Qb w - - 0 1)

Akerblom, Johan Axel

Arbeiter Schach Internationale, 1925

5nr1/1K1pBP1r/5R1p/6kp/8/8/5Nn1/6Qb

#2

6 + 9

15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Kh4
      • 2.Rg6#
  • Tries
    • 1.Qxg2+?
      • 1...Kh4
        • 2.Rf4#
        • 2.Rg6#
      • 1...Bxg2+!
    • 1.fxg8Q+?
      • 1...Kh4
        • 2.Rf4#
        • 2.Rf7#
        • 2.Qh2#
        • 2.Qxh1#
      • 1...Sg6
        • 2.Rf7#
      • 1...Rg7!
    • 1.fxg8R+?
      • 1...Kh4
        • 2.Rf4#
        • 2.Rf7#
        • 2.Qh2#
        • 2.Qxh1#
      • 1...Sg6
        • 2.Rf7#
      • 1...Rg7!
  • Keys
    • 1.Qb1!
      • threat
        • 2.Rf3#
      • 1...Sf4+
        • 2.Rc6#
      • 1...Kh4
        • 2.Rg6#
      • 1...Rxf7
        • 2.Rxf7#
      • 1...Rg6
        • 2.Rf5#
      • 1...Sg6
        • 2.Rf5#
      • 1...h4
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • K(c);N_SPINS(b),S_FLIGHT::B(E)+R(C)
  • Tries
    • Try
      • Q(A);CHECK,P_SPINQ(A),XS(b)
      • Refutation
        • B(a);CHECK,XQ(A)
    • Try
      • P(F);CHECK,XR(i)
      • Vars
        • S(h);::B(E)+R(C)
      • Refutation
        • R(g);P_SPINR(g)
    • Try
      • P(F);CHECK,XR(i)
      • Vars
        • S(h);::B(E)+R(C)
      • Refutation
        • R(g);P_SPINR(g)
  • Actual
    • Q(A);N_PINS(b)
    • Threat
      • B(E)+R(C)
    • Vars
      • S(b);CHECK,SBLOCK::B(E)+R(C)
      • K(c);S_FLIGHT::B(E)+R(C)
      • R(g);OGATE,XP(F)::B(E)+R(C),XR(g)
      • R(i);SBLOCK::B(E)+R(C),DCHECK
      • S(h);SBLOCK::B(E)+R(C),DCHECK
      • P(d);SBLOCK::QAR1(A)
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