MESON Chess Problem Database

Problem Display
PID: 17835 (8/8/2KPpr2/p3kP1p/PQ2N2N/1P4Pr/3P3p/3R2bn w - - 0 1)

Overkamp, Petrus

2nd Prize, Dutch JT, 1951-1952

8/8/2KPpr2/p3kP1p/PQ2N2N/1P4Pr/3P3p/3R2bn

#2

11 + 9

3105 FIDE Album (1945-1955) 1964
5862 An ABC of Chess Problems 1970
4640 Chess Wizardry: The New ABC of Chess Problems 1996
102 Probleemblad 2004
23 Die Schwalbe 2008

SOLUTION

  • SOUND
  • Sets
    • 1...Rxf5
      • 2.Sg6#
  • Tries
    • 1.Qc5+?
      • 1...Kxe4
        • 2.d3#
      • 1...Bxc5!
    • 1.d4+?
      • 1...Bxd4
        • 2.Qxd4#
      • 1...Kxe4!
  • Keys
    • 1.Sf2!
      • threat
        • 2.Sd3#
        • 2.Re1#
        • 2.Qc3#
        • 2.Qc5#
        • 2.Qe4#
        • 2.Qf4#
        • 2.d4#
      • 1...Rxg3
        • 2.Qe4#
      • 1...Rxh4
        • 2.Qc5#
      • 1...Rxf5
        • 2.Qc3#
      • 1...Bxf2
        • 2.Qf4#
      • 1...Sxf2
        • 2.Qf4#
      • 1...Sxg3
        • 2.Sd3#
      • 1...axb4
        • 2.d4#
      • 1...exf5
        • 2.Re1#
      • 1...Rg6
        • 2.Qc3#
      • 1...Rh6
        • 2.Qc3#
      • 1...Rf7
        • 2.Qc3#
      • 1...Rf8
        • 2.Qc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 11
    • REMOVED MATES = 0
  • Sets
    • R(i);N_GUARD,SBLOCK,XP(I)::S(H)
  • Tries
    • Try
      • Q(F);CHECK
      • Vars
        • K(f);P-FLIGHT,XS(G)::P(B)
      • Refutation
        • B(a);XQ(F)
    • Try
      • P(B);CHECK
      • Vars
        • B(a);OGATE,XP(B)::QAB1(F),XB(a)
      • Refutation
        • K(f);P-FLIGHT,XS(G)
  • Actual
    • S(G);
    • Threat
      • DUALS(7)
    • Vars
      • R(d);XP(D)::QAR1(F)
      • R(d);XS(H)::QAR2(F)
      • R(i);XP(I)::QAB(F)
      • B(a);XS(G)::QAB1(F)
      • S(b);XS(G)::QAB1(F)
      • S(b);XP(D)::S(G)
      • P(e);XQ(F)::P(B)
      • P(h);P_PINP(K),XP(I)::R(A)
      • R(i);::QAB(F)
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