MESON Chess Problem Database

Problem Display
PID: 268823 (8/4K1N1/4B3/3Q2P1/3N2bk/6p1/8/8 w - - 0 1)

Nichtawitz, Alois

Troll, 2022

(First published on Wed Jan 19 2022)

8/4K1N1/4B3/3Q2P1/3N2bk/6p1/8/8

#2

6 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kh3
      • 2.Qh1#
    • 1...Bf3
      • 2.Sxf3#
    • 1...Bh3
      • 2.Sf3#
  • Tries
    • 1.Qh1+?
      • 1...Bh3
        • 2.Sf3#
      • 1...Kxg5!
    • 1.Qe4?
      • threat
        • 2.Qxg4#
      • 1...Kh3
        • 2.Qh1#
      • 1...Kxg5!
  • Keys
    • 1.Qf3!
      • threat
        • 2.Qxg4#
      • 1...Kh3
        • 2.Qh1#
      • 1...Kxg5
        • 2.Qf6#
      • 1...Bxf3
        • 2.Sxf3#
      • 1...Bxe6
        • 2.Qh5#
      • 1...Bh3
        • 2.Qh5#
      • 1...Bf5
        • 2.Qh5#
      • 1...Bh5
        • 2.Qxh5#

This is after

After Behrens.

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(c);N_GUARD,P-FLIGHT,P_SPINB(b)::QAR2(B)
    • B(b);N_GUARD::S(A),XB(b)
    • B(b);N_GUARD::S(A)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • B(b);P_SPINB(b)::S(A)
      • Refutation
        • K(c);S_FLIGHT,XP(C)
    • Try
      • Q(B);P_PINB(b)
      • Threat
        • QAR1(B),XB(b)
      • Vars
        • K(c);N_GUARD,P-FLIGHT::QAR2(B)
      • Refutation
        • K(c);N_SPINB(b),S_FLIGHT,XP(C)
  • Actual
    • Q(B);
    • Threat
      • QAR1(B),XB(b)
    • Vars
      • K(c);N_GUARD,P-FLIGHT,P_SPINB(b),P_SPINP(a)::QAR2(B)
      • K(c);OGATEB,S_FLIGHT,XP(C)::QAB1(B)
      • B(b);XQ(B)::S(A),XB(b)
      • B(b);OGATE,XB(D)::QAR1(B)
      • B(b);OGATE::QAR1(B)
      • B(b);OGATE::QAR1(B),XB(b)
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