MESON Chess Problem Database

Problem Display
PID: 163832 (5bq1/1KQ5/2PR4/4k1N1/1p2ppn1/3rN3/3p1B2/5b2 w - - 0 1)

Sonnenfeld, Felix Alexander

Novi Temi, 1974

5bq1/1KQ5/2PR4/4k1N1/1p2ppn1/3rN3/3p1B2/5b2

#2

7 + 10

5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qf7
      • 2.Sxf7#
    • 1...Qh8
      • 2.Sf7#
    • 1...Rd4
      • 2.Re6#
    • 1...Sf6
      • 2.Rd5#
    • 1...f3
      • 2.Bg3#
  • Tries
    • 1.Rxd3+?
      • 1...Bd6
        • 2.Qxd6#
      • 1...Kf6!
    • 1.Qe7+?
      • 1...Qe6
        • 2.Sf7#
        • 2.Qxe6#
      • 1...Bxe7!
  • Keys
    • 1.Qf7!
      • threat
        • 2.Sc4#
      • 1...Qxf7+
        • 2.Sxf7#
      • 1...Kxd6
        • 2.Sc4#
      • 1...Rxe3
        • 2.Rd5#
      • 1...Rxd6
        • 2.Sxg4#
      • 1...Sxe3
        • 2.Qf6#
      • 1...fxe3
        • 2.Bg3#
      • 1...Rd5
        • 2.Rxd5#
      • 1...Ra3
        • 2.Rd5#
      • 1...Rb3
        • 2.Rd5#
      • 1...Rc3
        • 2.Rd5#
      • 1...Rd4
        • 2.Re6#
      • 1...Sf6
        • 2.Qxf6#

This anticipates 174340(1987)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 9
    • REMOVED MATES = 2
  • Sets
    • Q(j);N_GUARD,P_PINQ(G)::S(C),XQ(j)
    • Q(j);N_GUARD::S(C)
    • R(c);SBLOCK::QAB(G)+R(E),DCHECK
    • S(g);SBLOCK::QAB(G)+R(E),DCHECK
    • P(f);OGATEB::B(A)
  • Tries
    • Try
      • R(E);CHECK,XR(c)
      • Vars
        • B(i);N_GUARD,P_SPINB(i)::QAB1(G),XB(i)
      • Refutation
        • K(h);S_FLIGHT
    • Try
      • Q(G);CHECK
      • Refutation
        • B(i);XQ(G)
  • Actual
    • Q(G);
    • Threat
      • S(B)
    • Vars
      • Q(j);CHECK,XQ(G)::S(C),XQ(j)
      • K(h);S_FLIGHT,XR(E)::S(B)
      • R(c);N_GUARD,XS(B)::R1(E)
      • R(c);SBLOCK,XR(E)::S(B),XS(g)
      • S(g);N_GUARD,XS(B)::QAB1(G)
      • P(f);OGATEB,XS(B)::B(A)
      • R(c);N_GUARD::R1(E),XR(c)
      • R(c);N_GUARD::R1(E)
      • R(c);SBLOCK::R1(E)
      • S(g);N_GUARD::QAB1(G),XS(g)
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