MESON Chess Problem Database

Problem Display
PID: 149141 (N1b5/1pBkrP2/p3q3/1P6/8/2K1nQ1B/8/8 w - - 0 1)

Dehler, Otto Georg Edgar

Deutsche Schachblatter, 1932

N1b5/1pBkrP2/p3q3/1P6/8/2K1nQ1B/8/8

#2

7 + 7

15148 Sadier Collection 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Rxf7
      • 2.Qxf7#
    • 1...Sd1+
      • 2.Qxd1#
    • 1...Sf1
      • 2.Qd5#
      • 2.Qd3#
    • 1...Sc2
      • 2.Qd5#
    • 1...Sg2
      • 2.Qd1#
      • 2.Qd5#
      • 2.Qd3#
    • 1...Sd5+
      • 2.Qxd5#
    • 1...b6
      • 2.Qc6#
  • Tries
    • 1.Bxe6+?
      • 1...Kxe6
        • 2.f8S#
      • 1...Rxe6!
    • 1.Qd1+?
      • 1...Sd5+
        • 2.Qxd5#
      • 1...Sxd1+!
  • Keys
    • 1.Qh5!
      • threat
        • 2.f8S#
      • 1...Sd1+
        • 2.Qxd1#
      • 1...Sd5+
        • 2.Qxd5#
      • 1...Rxf7
        • 2.Qxf7#
      • 1...axb5
        • 2.Qxb5#
      • 1...Re8
        • 2.fxe8Q#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • R(f);OGATE,XP(F)::QAR2(B),XR(f)
    • S(a);CHECK,N_GUARD::QAR(B),XS(a)
    • S(a);N_GUARD::QAR2(B)
    • S(a);CHECK,N_GUARD::QAR2(B),XS(a)
    • P(d);N_GUARD::QAB1(B)
  • Tries
    • Try
      • B(C);CHECK,XQ(c)
      • Vars
        • K(e);S_FLIGHT,XB(C)::P=S
      • Refutation
        • R(f);XB(C)
    • Try
      • Q(B);CHECK
      • Vars
        • S(a);CHECK,N_GUARD,P_SPINS(a)::QAR2(B),XS(a)
      • Refutation
        • S(a);CHECK,XQ(B)
  • Actual
    • Q(B);
    • Threat
      • P=S
    • Vars
      • S(a);CHECK,N_GUARD::QAR(B),XS(a)
      • S(a);CHECK,N_GUARD::QAR2(B),XS(a)
      • R(f);OGATE,XP(F)::QAR2(B),XR(f)
      • P(b);OGATE,XP(D)::QAB(B),XP(b)
      • R(f);OGATE::PXR(f)=Q
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