MESON Chess Problem Database

Problem Display
PID: 18218 (4K3/1p6/Nrn5/1B3P1p/q2Pk3/4NR2/2n1PpQB/2r5 w - - 0 1)

Overkamp, Petrus

1st Prize, Israel Problemists' Association, 1954

4K3/1p6/Nrn5/1B3P1p/q2Pk3/4NR2/2n1PpQB/2r5

#2

10 + 9

273 Mat Plus 1994

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd4
      • 2.Rh3#
    • 1...Sxe3
      • 2.Rf4#
    • 1...S2xd4
      • 2.Bd3#
    • 1...S6xd4
      • 2.Sc5#
    • 1...h4
      • 2.Qg4#
  • Tries
    • 1.Sc4?
      • threat
        • 2.Rf4#
      • 1...Kxd4
        • 2.Rd3#
      • 1...Kd5
        • 2.Rd3#
        • 2.Rf4#
      • 1...Qxc4!
    • 1.Sg4?
      • threat
        • 2.Rf4#
      • 1...Kxd4
        • 2.Rd3#
      • 1...Kd5
        • 2.Rd3#
      • 1...hxg4!
    • 1.Rg3+?
      • 1...Kf4
        • 2.Rh3#
        • 2.Qf3#
      • 1...Kxd4!
  • Keys
    • 1.Sd5!
      • threat
        • 2.Rf4#
      • 1...Kxd4
        • 2.Rd3#
      • 1...Kxd5
        • 2.Rd3#
      • 1...Qxd4
        • 2.Rxf2#
      • 1...S2xd4
        • 2.Sf6#
      • 1...S6xd4
        • 2.Sc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • Q(d);SBLOCK,XP(F)::QAB(B)+R(E)
    • S(b);SBLOCK,XS(D)::QAB(B)+R(E),DCHECK
    • S(b);SBLOCK,XP(F)::B(G)
    • S(h);P_PINB(G),SBLOCK,XP(F)::S(I)
    • P(f);N_GUARD::QAR2(B)
  • Tries
    • Try
      • S(D);
      • Threat
        • QAB(B)+R(E),DCHECK
      • Vars
        • K(e);P-FLIGHT,XP(F)::R1(E)
      • Refutation
        • Q(d);XS(D)
    • Try
      • S(D);
      • Threat
        • QAB(B)+R(E),DCHECK
      • Vars
        • K(e);P-FLIGHT,XP(F)::R1(E)
        • K(e);S_FLIGHT::QAB(B)+R(E)
      • Refutation
        • P(f);XS(D)
    • Try
      • R(E);CHECK
      • Refutation
        • K(e);P-FLIGHT,XP(F)
  • Actual
    • S(D);
    • Threat
      • QAB(B)+R(E),DCHECK
    • Vars
      • K(e);P-FLIGHT,XP(F)::R1(E)
      • K(e);S_FLIGHT,XS(D)::QAB(B)+R(E)
      • Q(d);SBLOCK,XP(F)::QAB(B)+R(E),XP(c)
      • S(b);SBLOCK,XP(F)::S(D)
      • S(h);P_PINB(G),SBLOCK,XP(F)::S(D)
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