MESON Chess Problem Database

Problem Display
PID: 54616 (1r1B4/1b4p1/1p6/1Q3pr1/3kP2q/5Rn1/2P4b/1K6 w - - 0 1)

Sonnenfeld, Felix Alexander

4th HM., Guaratinqueta Chess Club, 1963

1r1B4/1b4p1/1p6/1Q3pr1/3kP2q/5Rn1/2P4b/1K6

#2

6 + 10

5309 O Mosqueteiro do Rei 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe4
      • 2.Bxb6#
    • 1...Bd5
      • 2.Qxd5#
    • 1...Ba6
      • 2.Qd5#
    • 1...Bc8
      • 2.Qd5#
    • 1...Sxe4
      • 2.Rd3#
    • 1...fxe4
      • 2.c3#
  • Tries
    • 1.Bf6+?
      • 1...Kxe4
        • 2.Qd3#
      • 1...gxf6!
    • 1.Qa4+?
      • 1...Kc5
        • 2.Be7#
      • 1...Ke5!
  • Keys
    • 1.Bc7!
      • threat
        • 2.Qb4#
      • 1...Kxe4
        • 2.Qd3#
      • 1...Qxe4
        • 2.Bxb6#
      • 1...Bxe4
        • 2.Be5#
      • 1...Sxe4
        • 2.Rd3#
      • 1...fxe4
        • 2.c3#
      • 1...Bd5
        • 2.Qxd5#
      • 1...Ba6
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • Q(d);P_PINP(B),SBLOCK,XP(D)::B(F),XP(g)
    • B(h);N_GUARD::QAR1(E),XB(h)
    • B(h);N_GUARD::QAR1(E)
    • S(b);SBLOCK,XP(D)::R1(C)
    • P(e);SBLOCK,XP(D)::P(B)
  • Tries
    • Try
      • B(F);CHECK
      • Vars
        • K(c);P-FLIGHT,XP(D)::QAB1(E)
      • Refutation
        • P(i);XB(F)
    • Try
      • Q(E);CHECK
      • Vars
        • K(c);S_FLIGHT::B(F)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • B(F);
    • Threat
      • QAR2(E)
    • Vars
      • K(c);P-FLIGHT,XP(D)::QAB1(E)
      • Q(d);P_PINP(B),SBLOCK,XP(D)::B(F),XP(g)
      • B(h);P_PINP(B),SBLOCK,XP(D)::B(F)
      • S(b);SBLOCK,XP(D)::R1(C)
      • P(e);SBLOCK,XP(D)::P(B)
      • B(h);N_GUARD::QAR1(E),XB(h)
      • B(h);N_GUARD::QAR1(E)
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