MESON Chess Problem Database

Problem Display
PID: 174340 (4N1bq/1K1Q4/1p1PR3/5k1p/5ppn/4rN2/4p1B1/6b1 w - - 0 1)

Loepert, Fritz

Sonnenfeld, Felix Alexander

Boletim da UBP, 1987

4N1bq/1K1Q4/1p1PR3/5k1p/5ppn/4rN2/4p1B1/6b1

#2

7 + 11

5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qg7
      • 2.Sxg7#
    • 1...Re4
      • 2.Rf6#
    • 1...Sg6
      • 2.Re5#
    • 1...g3
      • 2.Bh3#
  • Tries
    • 1.Rxe3+?
      • 1...Be6
        • 2.Qxe6#
      • 1...Kg6!
    • 1.Qf7+?
      • 1...Qf6
        • 2.Sg7#
        • 2.Qxf6#
      • 1...Bxf7!
  • Keys
    • 1.Qg7!
      • threat
        • 2.Sd4#
      • 1...Qxg7+
        • 2.Sxg7#
      • 1...Kxe6
        • 2.Sd4#
      • 1...Rxf3
        • 2.Re5#
      • 1...Rxe6
        • 2.Sxh4#
      • 1...Sxf3
        • 2.Qg6#
      • 1...gxf3
        • 2.Bh3#
      • 1...Re5
        • 2.Rxe5#
      • 1...Ra3
        • 2.Re5#
      • 1...Rb3
        • 2.Re5#
      • 1...Rc3
        • 2.Re5#
      • 1...Rd3
        • 2.Re5#
      • 1...Re4
        • 2.Rf6#
      • 1...Sg6
        • 2.Qxg6#

Anticipated by 163832(1974)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 10
    • REMOVED MATES = 1
  • Sets
    • Q(k);N_GUARD,P_PINQ(F)::S(G),XQ(k)
    • R(c);SBLOCK::QAB(F)+R(D),DCHECK
    • S(f);SBLOCK::QAB(F)+R(D),DCHECK
    • P(e);OGATEB::B(A)
  • Tries
    • Try
      • R(D);CHECK,XR(c)
      • Vars
        • B(j);N_GUARD,P_SPINB(j)::QAB1(F),XB(j)
      • Refutation
        • K(g);S_FLIGHT
    • Try
      • Q(F);CHECK
      • Refutation
        • B(j);XQ(F)
  • Actual
    • Q(F);
    • Threat
      • S(B)
    • Vars
      • Q(k);CHECK,XQ(F)::S(G),XQ(k)
      • K(g);S_FLIGHT,XR(D)::S(B)
      • R(c);N_GUARD,XS(B)::R1(D)
      • R(c);SBLOCK,XR(D)::S(B),XS(f)
      • S(f);N_GUARD,XS(B)::QAB1(F)
      • P(e);OGATEB,XS(B)::B(A)
      • R(c);N_GUARD::R1(D),XR(c)
      • R(c);N_GUARD::R1(D)
      • R(c);SBLOCK::R1(D)
      • S(f);N_GUARD::QAB1(F),XS(f)
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Developed and maintained by Brian Stephenson.
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