MESON Chess Problem Database

Problem Display
PID: 60016 (8/n1b3K1/2P1p1B1/1N2k3/2Pp4/BpQp1p2/1q4N1/7n w - - 0 1)

Touw Hian Bwee

1st Prize, Kolnische Rundschau, 1970

(First published on Sat Sep 26 1970)

8/n1b3K1/2P1p1B1/1N2k3/2Pp4/BpQp1p2/1q4N1/7n

#2

8 + 10

3751 FIDE Album (1968-1970) 1977
6352 A Collection of Chess Problems by Touw Hian Bwee 2008

SOLUTION

  • SOUND
  • Sets
    • 1...Qc1
      • 2.Qxd4#
    • 1...Qxa3
      • 2.Qe1#
      • 2.Qxd4#
    • 1...Qb1
      • 2.Qxd4#
    • 1...Qa2
      • 2.Qxd4#
    • 1...Qc2
      • 2.Qxd4#
    • 1...Qd2
      • 2.Qxd4#
    • 1...Qe2
      • 2.Qxd4#
    • 1...Qxg2
      • 2.Qxd4#
    • 1...Ba5
      • 2.Bd6#
    • 1...Bb6
      • 2.Bd6#
    • 1...Bd6
      • 2.Bxd6#
    • 1...Bd8
      • 2.Bd6#
  • Tries
    • 1.Sxd4?
      • threat
        • 2.Sxf3#
      • 1...Qxa3
        • 2.Sb5#
      • 1...Qxg2
        • 2.Se2#
      • 1...f2
        • 2.Sf3#
      • 1...fxg2!
    • 1.Bxb2?
      • threat
        • 2.Qe1#
        • 2.Qxd4#
      • 1...Sxc6
        • 2.Qe1#
      • 1...fxg2
        • 2.Qxd4#
      • 1...dxc3
        • 2.Bxc3#
      • 1...Ba5
        • 2.Qxd4#
      • 1...Bb6
        • 2.Qe1#
      • 1...Sf2
        • 2.Qxd4#
      • 1...Sg3
        • 2.Qxd4#
      • 1...d2
        • 2.Qxd4#
        • 2.Qe3#
      • 1...f2
        • 2.Qxd4#
      • 1...Sxb5!
  • Keys
    • 1.Qa5!
      • threat
        • 2.Qxc7#
      • 1...Qxa3
        • 2.Qe1#
      • 1...Bxa5
        • 2.Bd6#
      • 1...Sxb5
        • 2.Qxb5#
      • 1...Bb6
        • 2.Bd6#
      • 1...Bd6
        • 2.Bxd6#
      • 1...Bb8
        • 2.Sxa7#
      • 1...Bd8
        • 2.Bd6#
      • 1...Sc8
        • 2.Sxc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • Q(b);N_GUARD::QAB1(C),XP(f)
    • Q(b);N_GUARD,P_PINB(G),XS(A)::QAB1(C),XP(f)
    • B(j);N_GUARD::B(B)
    • B(j);N_GUARD::B(B),XB(j)
  • Tries
    • Try
      • S(E);XP(f)
      • Threat
        • QAB(C)+S(E),DCHECK,XP(e)
      • Vars
        • Q(b);N_GUARD,XB(B)::QAB(C)+S(E)
        • Q(b);N_GUARD,P_PINB(G),XS(A)::QAB(C)+S(E)
        • P(e);::QAB(C)+S(E),DCHECK
      • Refutation
        • P(e);XS(A)
    • Try
      • B(B);XQ(b)
      • Threat
        • DUALS(2)
      • Vars
        • S(i);XP(F)::QAR(C)
        • P(e);XS(A)::QAB1(C),XP(f)
        • P(f);OGATE,XQ(C)::B(B),XP(f)
        • B(j);::QAB1(C),XP(f)
        • B(j);::QAR(C)
        • S(a);::QAB1(C),XP(f)
        • P(e);::QAB1(C),XP(f)
      • Refutation
        • S(i);XS(E)
  • Actual
    • Q(C);N_PINP(f)
    • Threat
      • QAB(C),XB(j)
    • Vars
      • Q(b);N_GUARD,XB(B)::QAR(C)
      • B(j);N_GUARD,XQ(C)::B(B)
      • S(i);OGATE,P_SPINS(i),XS(E)::QAR(C),XS(i)
      • B(j);N_GUARD::B(B)
      • B(j);N_GUARD::B(B),XB(j)
      • B(j);N_GUARD::QAR(C)+S(E),XS(i)
      • S(i);N_GUARD::QAR(C)+S(E),XB(j)
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