MESON Chess Problem Database

Problem Display
PID: 654 (8/1K4b1/2p4q/5B2/Q7/B7/1R2P3/2k1n3 w - - 0 1)

Janet, Frank

British Chess Magazine, 1918

8/1K4b1/2p4q/5B2/Q7/B7/1R2P3/2k1n3

#2

6 + 5

3360 Simple Two-move Themes 1924
887 Mate in Two Moves 1931
5501 Chess Cameos 1936
5064 100 Years of the American Two-move Chess Problem 1962
274 diagrammes 1973
3310 2345 Chess Problems 1997
23 Die Schwalbe 2006
5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Qd2
      • 2.Rb1#
    • 1...Sc2
      • 2.Qxc2#
    • 1...Sg2
      • 2.Qc2#
    • 1...Sd3
      • 2.Qc2#
    • 1...Sf3
      • 2.Qc2#
  • Tries
    • 1.Bb4?
      • threat
        • 2.Rb1#
        • 2.Qa1#
      • 1...Kxb2
        • 2.Qa3#
      • 1...Sc2
        • 2.Qxc2#
      • 1...Bc3
        • 2.Qa1#
      • 1...Sd3
        • 2.Qc2#
        • 2.Qa1#
      • 1...Bxb2!
    • 1.Bc5?
      • threat
        • 2.Qa1#
      • 1...Kxb2
        • 2.Qa3#
      • 1...Sc2
        • 2.Qxc2#
      • 1...Bxb2!
    • 1.Bd6?
      • threat
        • 2.Qa1#
      • 1...Kxb2
        • 2.Qa3#
      • 1...Sc2
        • 2.Qxc2#
      • 1...Bxb2!
    • 1.Be7?
      • threat
        • 2.Qa1#
      • 1...Kxb2
        • 2.Qa3#
      • 1...Sc2
        • 2.Qxc2#
      • 1...Bxb2!
    • 1.Rd2+?
      • 1...Bb2
        • 2.Rd1#
        • 2.Qd1#
      • 1...Kxd2!
    • 1.Qf4+?
      • 1...Kd1
        • 2.Rd2#
      • 1...Qxf4!
  • Keys
    • 1.Bf8!
      • threat
        • 2.Qa1#
      • 1...Kxb2
        • 2.Qa3#
      • 1...Bxb2
        • 2.Bxh6#
      • 1...Sc2
        • 2.Qxc2#

This anticipates 65189(1935), 106513(1951)

This is after 2845

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • Q(d);SBLOCK::B(C)+R(A),DCHECK
    • S(b);N_GUARD::QAR1(D),XS(b)
    • S(b);N_GUARD::QAR1(D)
  • Tries
    • Try
      • B(C);
      • Threat
        • DUALS(2)
      • Vars
        • K(a);OGATEB,S_FLIGHT,XR(A)::QAB1(D)
        • S(b);N_GUARD::QAR1(D),XS(b)
        • B(e);::QAR2(D)
      • Refutation
        • B(e);XR(A)
    • Try
      • B(C);
      • Threat
        • QAR2(D)
      • Vars
        • K(a);OGATEB,S_FLIGHT,XR(A)::QAB1(D)
        • S(b);N_GUARD::QAR1(D),XS(b)
      • Refutation
        • B(e);XR(A)
    • Try
      • B(C);
      • Threat
        • QAR2(D)
      • Vars
        • K(a);OGATEB,S_FLIGHT,XR(A)::QAB1(D)
        • S(b);N_GUARD::QAR1(D),XS(b)
      • Refutation
        • B(e);XR(A)
    • Try
      • B(C);
      • Threat
        • QAR2(D)
      • Vars
        • K(a);OGATEB,S_FLIGHT,XR(A)::QAB1(D)
        • S(b);N_GUARD::QAR1(D),XS(b)
      • Refutation
        • B(e);XR(A)
    • Try
      • R(A);CHECK
      • Refutation
        • K(a);S_FLIGHT,XR(A)
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);P-FLIGHT::R1(A)
      • Refutation
        • Q(d);XQ(D)
  • Actual
    • B(C);
    • Threat
      • QAR2(D)
    • Vars
      • K(a);OGATEB,S_FLIGHT,XR(A)::QAB1(D)
      • B(e);OGATE,SBLOCK,XR(A)::B(C),XQ(d)
      • S(b);N_GUARD::QAR1(D),XS(b)
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