MESON Chess Problem Database

Problem Display
PID: 165513 (7q/r3R2p/b3N2n/3Q3r/3PNp2/3pkP2/8/3K1R2 w - - 0 1)

Ahues, Herbert Siegfried Oskar

Europa-Rochade, 1998

7q/r3R2p/b3N2n/3Q3r/3PNp2/3pkP2/8/3K1R2

#2

8 + 9

15148 Sadier Collection 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd4
      • 2.Qxd4#
  • Tries
    • 1.Sf6?
      • threat
        • 2.Qe4#
      • 1...Rxd5
        • 2.Sxd5#
      • 1...Re5
        • 2.Qxe5#
      • 1...Bb7
        • 2.Sg5#
      • 1...Qa8!
    • 1.Qa2?
      • threat
        • 2.Qd2#
        • 2.Qf2#
      • 1...d2
        • 2.Qxd2#
      • 1...Sg4
        • 2.Qd2#
      • 1...Rh2!
  • Keys
    • 1.S4g5!
      • threat
        • 2.Qe4#
      • 1...Qxd4
        • 2.Qxd4#
      • 1...Qe5
        • 2.Qxe5#
      • 1...Qa8
        • 2.Sc7#
      • 1...Bb7
        • 2.Sg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • Q(i);OGATE,XP(D)::QAB1(F),XQ(i)
  • Tries
    • Try
      • S(E);
      • Threat
        • QAR1(F)
      • Vars
        • R(d);XQ(F)::S(E),XR(d)
        • R(d);N_GUARD::QAR2(F),XR(d)
        • B(e);S_CUTR(g)::R(H)+S(G)
      • Refutation
        • Q(i);
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Vars
        • P(a);::QAB1(F),XP(a)
        • S(f);::QAB1(F)
      • Refutation
        • R(d);
  • Actual
    • S(E);
    • Threat
      • QAR1(F)
    • Vars
      • Q(i);OGATE,XP(D)::QAB1(F),XQ(i)
      • Q(i);N_GUARD::QAR2(F),XQ(i)
      • Q(i);N_GUARD::R(H)+S(G)
      • B(e);S_CUTR(g)::R(H)+S(G)
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