MESON Chess Problem Database

Problem Display
PID: 17771 (8/8/2p1Q3/2P5/p2Pp1Np/PP1k2nR/1n2N3/2KB4 w - - 0 1)

Hartong, Jan

1st Prize, Parallele 50, 1949/I

8/8/2p1Q3/2P5/p2Pp1Np/PP1k2nR/1n2N3/2KB4

#2

10 + 7

3105 FIDE Album (1945-1955) 1964
136 Problem Observer 2009
56 The Problemist 2011
133 The Problemist Supplement 2016
136 Problem Observer 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Sxd1
      • 2.Qc4#
    • 1...Sc4
      • 2.Qxc4#
    • 1...axb3
      • 2.Qxb3#
    • 1...e3
      • 2.Qxe3#
  • Tries
    • 1.Sf4+?
      • 1...Kxd4
        • 2.Qe5#
      • 1...Kc3!
    • 1.Rh2?
      • threat
        • 2.Bc2#
      • 1...Sxd1
        • 2.Qc4#
      • 1...axb3
        • 2.Qxb3#
      • 1...Sxe2+!
    • 1.Rxg3+?
      • 1...e3
        • 2.Sf2#
        • 2.Rxe3#
        • 2.Qf5#
        • 2.Qxe3#
        • 2.Qg6#
      • 1...hxg3!
    • 1.Qd5?
      • 1...Sxd1
        • 2.Qc4#
      • 1...axb3
        • 2.Qxb3#
      • 1...Sc4
        • 2.Qxc4#
      • 1...e3
        • 2.Se5#
      • 1...cxd5!
    • 1.Qf7?
      • 1...Sxd1
        • 2.Qc4#
      • 1...axb3
        • 2.Qxb3#
      • 1...Sc4
        • 2.Qxc4#
      • 1...e3!
    • 1.Qg8?
      • 1...Sxd1
        • 2.Qc4#
      • 1...axb3
        • 2.Qxb3#
      • 1...Sc4
        • 2.Qxc4#
      • 1...e3!
  • Keys
    • 1.Qh6!
      • threat
        • 2.Sf2#
        • 2.Se5#
        • 2.Qd2#
        • 2.Qe3#
      • 1...Sxd1
        • 2.Qd2#
      • 1...axb3
        • 2.Se5#
      • 1...e3
        • 2.Qxe3#
      • 1...Sc4
        • 2.Sf2#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD,XB(B)::QAB1(J)
    • S(a);N_GUARD::QAB1(J),XS(a)
    • P(d);OGATE,XP(E)::QAR2(J),XP(d)
    • P(e);N_SPINS(c),OGATE::QAR1(J),XP(e)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(b);N_SPINS(c),P-FLIGHT,XP(G)::QAB1(J)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • R(F);N_PINS(c)
      • Threat
        • B(B)
      • Vars
        • S(a);N_GUARD,XB(B)::QAB1(J)
        • P(d);OGATE,XP(E)::QAR2(J),XP(d)
      • Refutation
        • S(c);CHECK,XS(C)
    • Try
      • R(F);CHECK,XS(c)
      • Refutation
        • P(f);XR(F)
    • Try
      • Q(J);
      • Vars
        • S(a);N_GUARD,XB(B)::QAB1(J)
        • P(d);OGATE,XP(E)::QAR2(J),XP(d)
        • S(a);N_GUARD::QAB1(J),XS(a)
        • P(e);N_SPINS(c),SBLOCK::S(H)
      • Refutation
        • P(g);XQ(J)
    • Try
      • Q(J);
      • Vars
        • S(a);N_GUARD,XB(B)::QAB1(J)
        • P(d);OGATE,XP(E)::QAR2(J),XP(d)
        • S(a);N_GUARD::QAB1(J),XS(a)
      • Refutation
        • P(e);N_SPINS(c)
    • Try
      • Q(J);
      • Vars
        • S(a);N_GUARD,XB(B)::QAB1(J)
        • P(d);OGATE,XP(E)::QAR2(J),XP(d)
        • S(a);N_GUARD::QAB1(J),XS(a)
      • Refutation
        • P(e);N_SPINS(c)
  • Actual
    • Q(J);
    • Threat
      • DUALS(4)
    • Vars
      • S(a);XB(B)::QAR1(J)
      • P(d);XP(E)::S(H)
      • P(e);N_SPINS(c)::QAR1(J),XP(e)
      • S(a);::S(H)
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