MESON Chess Problem Database

Problem Display
PID: 41850 (3R1RBb/5N1P/K6B/4p3/1p1Pk1Pn/1P6/Q1n3P1/2r1N3 w - - 0 1)

Postma, Bernardus

1st Prize, Tijdschrift vd KNSB, 1947

3R1RBb/5N1P/K6B/4p3/1p1Pk1Pn/1P6/Q1n3P1/2r1N3

#2

13 + 7

461 Schach-Express 1948

SOLUTION

  • SOUND
  • Sets
    • 1...Rb1
      • 2.Qxc2#
    • 1...Rxe1
      • 2.Qxc2#
    • 1...Sa1
      • 2.Qe2#
    • 1...Sxe1
      • 2.Qe2#
    • 1...Sa3
      • 2.Qe2#
    • 1...Se3
      • 2.Sg5#
    • 1...Sxd4
      • 2.Sd6#
    • 1...Sf3
      • 2.gxf3#
  • Tries
    • 1.Bxc1?
      • threat
        • 2.Sg5#
        • 2.Qxc2#
      • 1...Sxe1
        • 2.Qe2#
      • 1...Sxd4
        • 2.Sg5#
        • 2.Sd6#
      • 1...Se3
        • 2.Sg5#
      • 1...Bf6
        • 2.Qxc2#
      • 1...Sa1
        • 2.Sg5#
        • 2.Qe2#
      • 1...Sa3
        • 2.Sg5#
        • 2.Qe2#
      • 1...Sf3
        • 2.Qxc2#
        • 2.gxf3#
      • 1...exd4!
  • Keys
    • 1.Kb6!
      • threat
        • 2.Qa8#
      • 1...Rxe1
        • 2.Qxc2#
      • 1...Sxe1
        • 2.Qe2#
      • 1...Sxd4
        • 2.Sd6#
      • 1...Ra1
        • 2.Qxc2#
      • 1...Sa1
        • 2.Qe2#
      • 1...Sa3
        • 2.Qe2#
      • 1...Se3
        • 2.Sg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • R(a);N_GUARD::QAB(B),XS(b)
    • R(a);N_GUARD,XS(A)::QAB(B),XS(b)
    • S(b);OGATE::QAR2(B)
    • S(b);OGATE,XS(A)::QAR2(B)
    • S(b);SBLOCK::S(I)
    • S(b);SBLOCK,XP(E)::S(I)
    • S(e);OGATE::P(C),XS(e)
  • Tries
    • Try
      • B(H);XR(a)
      • Threat
        • DUALS(2)
      • Vars
        • S(b);OGATE,XS(A)::QAR2(B)
        • S(b);::S(I)
        • B(g);::QAB(B),XS(b)
      • Refutation
        • P(f);XP(E)
  • Actual
    • K(G);P-FLIGHT
    • Threat
      • QAB(B)
    • Vars
      • R(a);N_GUARD,XS(A)::QAB(B),XS(b)
      • S(b);OGATE,XS(A)::QAR2(B)
      • S(b);SBLOCK,XP(E)::S(I)
      • R(a);N_GUARD::QAB(B),XS(b)
      • S(b);OGATE::QAR2(B)
      • S(b);SBLOCK::S(I)
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