MESON Chess Problem Database

Problem Display
PID: 159150 (2q3N1/2b2QPb/4p3/3p4/2n1kPR1/1N4K1/4PP2/8 w - - 0 1)

Ahs, Carl Johan Mathias

Skakbladet, 1934

2q3N1/2b2QPb/4p3/3p4/2n1kPR1/1N4K1/4PP2/8

#2

9 + 7

15148 Sadier Collection 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Bxf4+
      • 2.Qxf4#
    • 1...Bf5
      • 2.Sf6#
    • 1...Bg6
      • 2.Qxg6#
    • 1...Bxg8
      • 2.Qg6#
    • 1...Se3
      • 2.f3#
    • 1...e5
      • 2.f5#
  • Tries
    • 1.Qxe6+?
      • 1...Be5
        • 2.Sf6#
        • 2.fxe5#
      • 1...Se5
        • 2.Sf6#
        • 2.fxe5#
        • 2.f5#
      • 1...Qxe6!
    • 1.Qf5+?
      • 1...Bxf5
        • 2.Sf6#
      • 1...exf5
        • 2.Sf6#
      • 1...Kxf5!
  • Keys
    • 1.Sf6+!
      • 1...Kf5
        • 2.Sd4#
        • 2.Rg5#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 6
  • Sets
    • B(e);CHECK,OGATE,P_SPINB(e),XP(E)::QAR1(G),XB(e)
    • B(f);SBLOCK::S(I)
    • B(f);N_GUARD::QAB(G),XB(f)
    • B(f);N_GUARD,XS(I)::QAB(G)
    • S(a);SBLOCK::P(B)
    • P(d);N_PINP(E),SBLOCK::R(F)+P(E)
  • Tries
    • Try
      • Q(G);CHECK,XP(d)
      • Refutation
        • Q(g);XQ(G)
    • Try
      • Q(G);CHECK
      • Vars
        • B(f);SBLOCK,XQ(G)::S(I)
        • P(d);SBLOCK,XQ(G)::S(I)
      • Refutation
        • K(b);S_FLIGHT,XQ(G)
  • Actual
    • S(I);CHECK
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