MESON Chess Problem Database

Problem Display
PID: 260785 (q1Rr1b2/1nBn1N2/2k1P3/Pr3p2/1p3Np1/4Q1K1/2B5/8 w - - 0 1)

Johner, Hans

Neue Zurcher Zeitung, 1931

q1Rr1b2/1nBn1N2/2k1P3/Pr3p2/1p3Np1/4Q1K1/2B5/8

#2

9 + 10

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qa6
      • 2.Bxd8#
    • 1...Qa7
      • 2.Bxd8#
    • 1...Sxa5
      • 2.Sxd8#
    • 1...Sbc5
      • 2.Sxd8#
    • 1...Sd6
      • 2.Sxd8#
    • 1...Sdc5
      • 2.Se5#
    • 1...Sb8
      • 2.Bxd8#
  • Tries
    • 1.Qf3+?
      • 1...Kc5
        • 2.Bb6#
        • 2.Qd5#
      • 1...Rd5
        • 2.Qxd5#
      • 1...gxf3!
    • 1.Qe4+?
      • 1...Kc5
        • 2.Sd3#
        • 2.Bb6#
        • 2.Bd6#
        • 2.Qd5#
      • 1...Rd5
        • 2.Qxd5#
      • 1...fxe4!
  • Keys
    • 1.Qc1!
      • threat
        • 2.Be4#
      • 1...Kc5
        • 2.Bb6#
      • 1...Rxa5
        • 2.Ba4#
      • 1...Rd5
        • 2.Ba4#
      • 1...Re5
        • 2.Ba4#
      • 1...Rb6
        • 2.Ba4#
      • 1...Rc5
        • 2.Ba4#
      • 1...Bc5
        • 2.Qh1#
      • 1...Sbc5
        • 2.Sxd8#
      • 1...Sdc5
        • 2.Se5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 5
  • Sets
    • Q(h);N_GUARD::R(I)+B(G),XR(i)
    • S(f);N_GUARD,XP(E)::S(H),XR(i)
    • S(f);N_GUARD::S(H),XR(i)
    • S(g);N_GUARD,S_CUTR(c)::S(H)
    • S(g);S_CUTQ(h)::R(I)+B(G),XR(i)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • R(c);N_GUARD,P_SPINR(c)::QAB1(B),XR(c)
      • Refutation
        • P(b);XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • R(c);N_GUARD,P_SPINR(c)::QAB1(B),XR(c)
      • Refutation
        • P(d);XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAR(B)+B(A),DCHECK
    • Vars
      • K(e);P-FLIGHT::R(I)+B(G),DCHECK
      • R(c);XP(E)::QAR(B)+B(A),DCHECK
      • R(c);::QAR(B)+B(A),DCHECK
      • R(c);S_CUTB(j),S_CUTS(f),S_CUTS(g)::B(A)
      • B(j);SBLOCK,S_CUTR(c)::QAB(B)
      • S(f);N_GUARD,SBLOCK::S(H),XR(i)
      • S(g);N_GUARD,SBLOCK,S_CUTR(c)::S(H)
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