MESON Chess Problem Database

Problem Display
PID: 4970 (5K2/3PRnQB/2p5/3p4/5k2/7q/2N5/4N3 w - - 0 1)

Challenger, Alfred Clement

The Schoolmaster, 1895

5K2/3PRnQB/2p5/3p4/5k2/7q/2N5/4N3

#2

7 + 5

187 The Chess Bouquet 1897
236 The Field 1914
268 Chess Life 1953
3310 2345 Chess Problems 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Qf1
      • 2.Rxf7#
    • 1...Qg2
      • 2.Rxf7#
    • 1...Qh1
      • 2.Rxf7#
    • 1...Qh2
      • 2.Rxf7#
    • 1...Qb3
      • 2.Rxf7#
    • 1...Qe3
      • 2.Rxf7#
    • 1...Qf3
      • 2.Rxf7#
    • 1...Qg3
      • 2.Rxf7#
    • 1...d4
      • 2.Re4#
  • Tries
    • 1.Sg2+?
      • 1...Qxg2
        • 2.Rxf7#
      • 1...Kf3!
    • 1.Sd3+?
      • 1...Kf3
        • 2.Sce1#
        • 2.Sd4#
        • 2.Re3#
      • 1...Qxd3!
  • Keys
    • 1.Se3!
      • 1...Qxd7
        • 2.S3g2#
      • 1...Qxe3
        • 2.Rxf7#
      • 1...Qxh7
        • 2.Qg4#
      • 1...Qg4
        • 2.Qxg4#
      • 1...Qe6
        • 2.S3g2#
      • 1...Se5
        • 2.Qxe5#
      • 1...Sg5
        • 2.Qe5#
      • 1...Qf1
        • 2.Qg4#
      • 1...Qg2
        • 2.S3xg2#
      • 1...Qf5
        • 2.S3g2#
      • 1...Qh1
        • 2.Qg4#
      • 1...Qh2
        • 2.Qg4#
      • 1...Qf3
        • 2.Sd3#
      • 1...Qg3
        • 2.Qf6#
      • 1...Qh4
        • 2.S3g2#
      • 1...Qh5
        • 2.S3g2#
      • 1...Qh6
        • 2.S3g2#
      • 1...Sd6
        • 2.Qe5#
      • 1...Sh6
        • 2.Qe5#
      • 1...Sd8
        • 2.Qe5#
      • 1...Sh8
        • 2.Qe5#
      • 1...d4
        • 2.Re4#
      • 1...c5
        • 2.Sxd5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 6
    • ADDED MATES = 15
    • REMOVED MATES = 1
  • Sets
    • Q(a);N_GUARD::R(D),XS(e)
    • P(c);N_GUARD::R1(D)
  • Tries
    • Try
      • S(A);CHECK
      • Vars
        • Q(a);XS(A)::R(D),XS(e)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • S(A);CHECK
      • Refutation
        • Q(a);XS(A)
  • Actual
    • S(B);
    • Vars
      • Q(a);N_GUARD,XP(C)::S(B)
      • Q(a);N_GUARD,SBLOCK,XS(B)::R(D),XS(e)
      • Q(a);N_GUARD,XB(F)::QAR1(E)
      • Q(a);N_GUARD::QAR1(E),XQ(a)
      • Q(a);N_GUARD::S(B)
      • S(e);N_GUARD::QAB1(E),XS(e)
      • S(e);N_GUARD::QAB1(E)
      • Q(a);N_GUARD::QAR1(E)
      • Q(a);N_GUARD::S(B),XQ(a)
      • Q(a);SBLOCK::S(A)
      • Q(a);N_GUARD,SBLOCK::QAR2(E)
      • Q(a);N_GUARD,P_PINQ(E)::S(B)
      • P(c);N_GUARD::R1(D)
      • P(d);N_GUARD::S(B),XP(c)
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