MESON Chess Problem Database

Problem Display
PID: 72517 (3r4/2p5/4pnQ1/R2Pk3/5pPb/2N4K/q3N3/B3R2B w - - 0 1)

Cristoffanini, Guido

1st Prize, Tijdschrift vd NSB, 1931

3r4/2p5/4pnQ1/R2Pk3/5pPb/2N4K/q3N3/B3R2B

#2

10 + 8

371 The Chess Review 1933
133 The Problemist Supplement 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd5
      • 2.Se4#
    • 1...Qxe2
      • 2.Sb5#
    • 1...Rd6
      • 2.Sxa2#
    • 1...Se4
      • 2.Qxe6#
    • 1...Sxg4
      • 2.Qxe6#
    • 1...Sh5
      • 2.Qxe6#
    • 1...Sd7
      • 2.Qxe6#
    • 1...Sh7
      • 2.Qxe6#
    • 1...Se8
      • 2.Qxe6#
    • 1...Sg8
      • 2.Qxe6#
  • Tries
    • 1.Se4+?
      • 1...Qb2
        • 2.Bxb2#
      • 1...Qxa1!
    • 1.Sb5+?
      • 1...Qb2
        • 2.Bxb2#
      • 1...Qxa1!
    • 1.Qe4+?
      • 1...Kd6
        • 2.Qxe6#
      • 1...Sxe4!
    • 1.Qf5+?
      • 1...Kd6
        • 2.Qxe6#
      • 1...exf5!
  • Keys
    • 1.Qf7!
      • threat
        • 2.Qxe6#
      • 1...Kd6
        • 2.Qxe6#
      • 1...Qxd5
        • 2.Se4#
      • 1...Qxe2
        • 2.Sb5#
      • 1...Rxd5
        • 2.Qxc7#
      • 1...Sxd5
        • 2.Qxf4#
      • 1...exd5
        • 2.Qe7#
      • 1...Rd6
        • 2.Sxa2#
      • 1...Re8
        • 2.Qxc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 7
  • Sets
    • Q(a);N_GUARD,P_SPINQ(a),XP(I)::B(A)+S(E)
    • Q(a);N_GUARD,P_SPINQ(a),XS(D)::B(A)+S(E)
    • R(h);SBLOCK::B(A)+S(E),XQ(a)
    • S(f);OGATE::QAR1(J),XP(e)
    • S(f);OGATE,XP(G)::QAR1(J),XP(e)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a)::B(A),XQ(a)
      • Refutation
        • Q(a);XB(A)
    • Try
      • S(E);CHECK
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a)::B(A),XQ(a)
      • Refutation
        • Q(a);XB(A)
    • Try
      • Q(J);CHECK
      • Vars
        • K(d);OGATE,S_FLIGHT::QAR1(J),XP(e)
      • Refutation
        • S(f);XQ(J)
    • Try
      • Q(J);CHECK
      • Vars
        • K(d);S_FLIGHT::QAR1(J),XP(e)
      • Refutation
        • P(e);XQ(J)
  • Actual
    • Q(J);
    • Threat
      • QAR1(J),XP(e)
    • Vars
      • K(d);S_FLIGHT::QAR1(J),XP(e)
      • Q(a);N_GUARD,P_SPINQ(a),XP(I)::B(A)+S(E)
      • Q(a);N_GUARD,P_SPINQ(a),XS(D)::B(A)+S(E)
      • R(h);N_GUARD,P_SPINR(h),XP(I)::QAB(J),XP(g)
      • S(f);OGATE,P_SPINS(f),XP(I)::QAB1(J),XP(b)
      • P(e);OGATEB,P_SPINP(e),XP(I)::QAR2(J)
      • R(h);SBLOCK::B(A)+S(E),XQ(a)
      • R(h);N_GUARD::QAB(J),XP(g)
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