MESON Chess Problem Database

Problem Display
PID: 9973 (4r3/1B6/1qR5/1p1N1n1n/1R6/3QPkpK/5p2/3N4 w - - 0 1)

Issler, Werner

1/3 Prize, Deutsche Schachzeitung, 1961

4r3/1B6/1qR5/1p1N1n1n/1R6/3QPkpK/5p2/3N4

#2

8 + 8

15257 Kunstwerke auf 64 Feldern (1922-1966) (Ott, Kummer, Schudel) 1968
5862 An ABC of Chess Problems 1970
133 The Problemist Supplement 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Sd4
      • 2.e4#
    • 1...Sf4+
      • 2.Rxf4#
    • 1...Sf6
      • 2.Rf4#
    • 1...Sg7
      • 2.Rf4#
    • 1...f1Q+
      • 2.Qxf1#
    • 1...f1S
      • 2.Qxf1#
    • 1...f1B+
      • 2.Qxf1#
    • 1...f1R
      • 2.Qxf1#
  • Tries
    • 1.Rc2?
      • threat
        • 2.Qe2#
      • 1...Sf4+
        • 2.Rxf4#
      • 1...f1Q+
        • 2.Qxf1#
      • 1...f1B+
        • 2.Qxf1#
      • 1...Qxe3
        • 2.Se7#
      • 1...Rxe3
        • 2.Sxb6#
      • 1...Sd4
        • 2.e4#
      • 1...Qd4!
  • Keys
    • 1.S5c3!
      • threat
        • 2.Qe2#
      • 1...Sf4+
        • 2.Rxf4#
      • 1...f1Q+
        • 2.Qxf1#
      • 1...f1B+
        • 2.Qxf1#
      • 1...Qxe3
        • 2.Re6#
      • 1...Rxe3
        • 2.Rxb6#
      • 1...Sd4
        • 2.Rf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • S(e);N_GUARD,S_CUTQ(g)::QAR(B)+P(C)
    • S(f);CHECK,N_GUARD::R1(E),XS(f)
    • S(f);N_GUARD::R1(E)
    • P(a);CHECK,OGATEB::QAR2(B),XQ(a)
    • P(a);OGATEB::QAR2(B),XS(a)
    • P(a);CHECK,OGATEB::QAR2(B),XB(a)
    • P(a);OGATEB::QAR2(B),XR(a)
  • Tries
    • Try
      • R(G);
      • Threat
        • QAB1(B)
      • Vars
        • S(f);CHECK,N_GUARD::R1(E),XS(f)
        • P(a);CHECK,OGATEB::QAR2(B),XQ(a)
        • P(a);CHECK,OGATEB::QAR2(B),XB(a)
        • Q(g);N_GUARD,P_SPINQ(g),XP(C)::B(H)+S(F)
        • R(h);N_GUARD,P_SPINR(h),XP(C)::B(H)+S(F),XQ(g)
        • S(e);N_GUARD,S_CUTQ(g)::QAR(B)+P(C)
      • Refutation
        • Q(g);
  • Actual
    • S(F);
    • Threat
      • QAB1(B)
    • Vars
      • S(f);CHECK,N_GUARD::R1(E),XS(f)
      • P(a);CHECK,OGATEB::QAR2(B),XQ(a)
      • P(a);CHECK,OGATEB::QAR2(B),XB(a)
      • Q(g);N_GUARD,P_SPINQ(g),XP(C)::B(H)+R(G)
      • R(h);N_GUARD,P_SPINR(h),XP(C)::B(H)+R(G),XQ(g)
      • S(e);::B(H)+R(G),DCHECK
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