MESON Chess Problem Database

Problem Display
PID: 9464 (8/1p6/1p6/RnNP4/1k2P3/1P2K3/8/Q7 w - - 0 1)

Juchli, Josef

Schweizerische Schachzeitung, 1903

8/1p6/1p6/RnNP4/1k2P3/1P2K3/8/Q7

#2

7 + 4

3360 Simple Two-move Themes 1924
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kxc5
      • 2.Qa3#
    • 1...Sa3
      • 2.Qe1#
    • 1...Sc3
      • 2.Qa3#
    • 1...Sd4
      • 2.Qe1#
    • 1...Sd6
      • 2.Qe1#
    • 1...Sa7
      • 2.Qe1#
    • 1...Sc7
      • 2.Qe1#
  • Tries
    • 1.Kd3?
      • 1...Kxc5
        • 2.Qa3#
      • 1...bxc5
        • 2.Qa4#
      • 1...Sa3
        • 2.Qc3#
        • 2.Qe1#
        • 2.Qxa3#
      • 1...Sc3
        • 2.Qxc3#
        • 2.Qa3#
      • 1...Sd4
        • 2.Qc3#
        • 2.Qe1#
        • 2.Qa3#
        • 2.Qa4#
      • 1...Sd6
        • 2.Qc3#
        • 2.Qe1#
        • 2.Qa3#
        • 2.Qa4#
      • 1...Sa7
        • 2.Qc3#
        • 2.Qe1#
        • 2.Qa3#
        • 2.Qa4#
      • 1...Sc7
        • 2.Qc3#
        • 2.Qe1#
        • 2.Qa3#
        • 2.Qa4#
      • 1...bxa5!
    • 1.Qd4+?
      • 1...Kxa5
        • 2.Qa4#
        • 2.b4#
      • 1...Sxd4!
    • 1.Qa4+?
      • 1...Kxc5
        • 2.Qa3#
      • 1...Kc3!
  • Keys
    • 1.Qb2!
      • 1...Kxa5
        • 2.b4#
      • 1...Kxc5
        • 2.Qa3#
      • 1...bxa5
        • 2.Sd3#
      • 1...bxc5
        • 2.Ra4#
      • 1...Sa3
        • 2.Qd2#
      • 1...Sc3
        • 2.Qa3#
      • 1...Sd4
        • 2.Qd2#
      • 1...Sd6
        • 2.Qd2#
      • 1...Sa7
        • 2.Qd2#
      • 1...Sc7
        • 2.Qd2#

This anticipates 195752(1921)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 5
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(a);P_SPINS(b),S_FLIGHT,XS(F)::QAB(A)
    • S(b);N_GUARD::QAB(A)
    • S(b);N_GUARD,SBLOCK::QAB1(A)
  • Tries
    • Try
      • K(C);P-FLIGHT
      • Vars
        • K(a);P_SPINS(b),S_FLIGHT,XS(F)::QAB(A)
        • P(c);SBLOCK,XS(F)::QAR1(A)
      • Refutation
        • P(c);XR(E)
    • Try
      • Q(A);CHECK
      • Refutation
        • S(b);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);P_SPINS(b),S_FLIGHT,XS(F)::QAB(A)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(A);
    • Vars
      • K(a);OGATE,S_FLIGHT,XR(E)::P(B)
      • K(a);P_SPINS(b),S_FLIGHT,XS(F)::QAB(A)
      • P(c);SBLOCK,XR(E)::S(F)
      • P(c);SBLOCK,XS(F)::R1(E)
      • S(b);N_GUARD::QAB(A)
      • S(b);N_GUARD,SBLOCK::QAB1(A)
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