MESON Chess Problem Database

Problem Display
PID: 60621 (2B1nN1K/r2rp2P/7N/4k1Pn/2PR3q/3P2p1/1Q5B/b7 w - - 0 1)

Retter, Yosef

2nd Place, FIDE Ty., 1970

2B1nN1K/r2rp2P/7N/4k1Pn/2PR3q/3P2p1/1Q5B/b7

#2

11 + 9

3751 FIDE Album (1968-1970) 1977

SOLUTION

  • SOUND
  • Sets
    • 1...Qf4
      • 2.Rd5#
    • 1...Rd5
      • 2.Sf7#
    • 1...Rd6
      • 2.Sf7#
      • 2.Re4#
    • 1...Rb7
      • 2.Sf7#
      • 2.Sg6#
    • 1...Rc7
      • 2.Sf7#
      • 2.Sg6#
    • 1...Rd8
      • 2.Sf7#
      • 2.Sg6#
    • 1...Sf4
      • 2.Rd5#
    • 1...Sd6
      • 2.Re4#
    • 1...e6
      • 2.Sg6#
  • Tries
    • 1.Qe2+?
      • 1...Qe4
        • 2.Qxe4#
      • 1...Kxd4!
    • 1.Qf2?
      • threat
        • 2.Sf7#
      • 1...Sf4
        • 2.Qe3#
      • 1...Sd6
        • 2.Rd5#
      • 1...e6
        • 2.Sg6#
      • 1...Qf4!
    • 1.Qb5+?
      • 1...Rd5
        • 2.Qxd5#
      • 1...Kxd4!
  • Keys
    • 1.Qb6!
      • threat
        • 2.Sg6#
      • 1...Qxg5
        • 2.Re4#
      • 1...Qe4
        • 2.Rxe4#
      • 1...Rd6
        • 2.Sf7#
      • 1...Sf4
        • 2.Re4#
      • 1...Sd6
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(c);N_SPINP(b),SBLOCK::QAB(A)+R(E),DCHECK
    • R(g);::S(G)
    • S(e);N_SPINP(b),SBLOCK::QAB(A)+R(E),DCHECK
    • S(i);SBLOCK::QAB(A)+R(E),DCHECK
    • P(h);SBLOCK::S(J)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • Q(c);N_GUARD,P_SPINQ(c)::QAR1(A),XQ(c)
      • Refutation
        • K(d);N_SPINP(b),S_FLIGHT,XR(E)
    • Try
      • Q(A);
      • Threat
        • S(G)
      • Vars
        • S(e);N_SPINP(b),S_CUTQ(c)::QAR2(A)
        • S(i);S_CUTR(g)::R1(E)
        • P(h);SBLOCK::S(J)
      • Refutation
        • Q(c);N_SPINP(b)
    • Try
      • Q(A);CHECK
      • Vars
        • R(g);N_GUARD,P_SPINR(g)::QAR1(A),XR(g)
      • Refutation
        • K(d);N_SPINP(b),S_FLIGHT,XR(E)
  • Actual
    • Q(A);
    • Threat
      • S(J)
    • Vars
      • Q(c);N_GUARD,XP(F)::R1(E)
      • Q(c);N_GUARD::R1(E),XQ(c)
      • R(g);::S(G)
      • S(e);N_SPINP(b),S_CUTQ(c)::R1(E)
      • S(i);S_CUTR(g)::QAR2(A)
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