MESON Chess Problem Database

Problem Display
PID: 29768 (4RK2/4Q3/3p1R2/2b1BN2/2r1k1p1/2p5/2Npp3/3n4 w - - 0 1)

Wurzburg, Otto

Pittsburgh Post, 1925

4RK2/4Q3/3p1R2/2b1BN2/2r1k1p1/2p5/2Npp3/3n4

#2

7 + 9

3325 Wurzburg Artistry 1974
56 The Problemist 2002

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Qb7#
  • Tries
    • 1.Sg3+?
      • 1...Kd5
        • 2.Qb7#
      • 1...Kd3!
    • 1.Bh2+?
      • 1...Kf3
        • 2.Sh4#
        • 2.Qxe2#
      • 1...Kd5
        • 2.Qb7#
      • 1...Kd3!
    • 1.Bg3+?
      • 1...Kf3
        • 2.Qxe2#
      • 1...Kd5
        • 2.Qb7#
      • 1...Kd3!
    • 1.Bd4+?
      • 1...Kd3
        • 2.Qe4#
      • 1...Kf3
        • 2.Qe4#
      • 1...Kd5
        • 2.Qe4#
        • 2.Qb7#
      • 1...Kf4!
    • 1.Bxd6+?
      • 1...Kf3
        • 2.Sh4#
        • 2.Qxe2#
      • 1...Kd5
        • 2.Qb7#
      • 1...Kd3!
  • Keys
    • 1.Qh7!
      • threat
        • 2.Sfe3#
      • 1...dxe5+
        • 2.Se7#
      • 1...d5+
        • 2.Sd6#
      • 1...Kd3
        • 2.Sfd4#
      • 1...Kf3
        • 2.Sh4#
      • 1...Kd5
        • 2.Qb7#
      • 1...Be3
        • 2.Sfxe3#
      • 1...Se3
        • 2.Sfxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • K(f);S_FLIGHT::QAB(E)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(f);S_FLIGHT::QAB(E)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • B(B);CHECK
      • Vars
        • K(f);S_FLIGHT::QAB(E)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • B(B);CHECK
      • Vars
        • K(f);OGATE,S_FLIGHT::QAB1(E),XP(c)
        • K(f);S_FLIGHT::QAB(E)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • B(B);CHECK
      • Vars
        • K(f);S_FLIGHT::QAB1(E)
      • Refutation
        • K(f);P-FLIGHT
    • Try
      • B(B);CHECK,XP(i)
      • Vars
        • K(f);S_FLIGHT::QAB(E)
      • Refutation
        • K(f);S_FLIGHT
  • Actual
    • Q(E);
    • Threat
      • QAB(E)+S(C)
    • Vars
      • P(i);CHECK,P_SPINP(i),SBLOCK,XB(B)::QAB(E)+S(C)
      • P(i);CHECK,SBLOCK::QAB(E)+S(C),DCHECK
      • K(f);S_FLIGHT::QAB(E)+S(C)
      • K(f);S_FLIGHT::R(D)+S(C),DCHECK
      • K(f);S_FLIGHT::QAB(E)
      • B(h);::QAB(E)+S(C),XB(h)
      • S(a);::QAB(E)+S(C),XS(a)
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