MESON Chess Problem Database

Problem Display
PID: 21122 (4N3/8/4p3/3pk3/4p1K1/3B1n2/2N1Q3/8 w - - 0 1)

Nanning, Willem

Algemeen Handelsblad, 1917

4N3/8/4p3/3pk3/4p1K1/3B1n2/2N1Q3/8

#2

5 + 5

3360 Simple Two-move Themes 1924
3310 2345 Chess Problems 1997
5398 My Chess Compositions 2003
5454 Near Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Se1
      • 2.Qh2#
    • 1...Sg1
      • 2.Qh2#
    • 1...Sd2
      • 2.Qh2#
    • 1...Sh2+
      • 2.Qxh2#
    • 1...Sd4
      • 2.Qh2#
    • 1...Sh4
      • 2.Qh2#
    • 1...Sg5
      • 2.Qh2#
    • 1...e3
      • 2.Qxe3#
    • 1...d4
      • 2.Qxe4#
  • Tries
    • 1.Bb5?
      • 1...Sh2+
        • 2.Qxh2#
      • 1...e3
        • 2.Qxe3#
      • 1...Se1
        • 2.Qh2#
      • 1...Sg1
        • 2.Qh2#
      • 1...Sd2
        • 2.Qh2#
      • 1...Sd4
        • 2.Qh2#
      • 1...Sh4
        • 2.Qh2#
      • 1...Sg5
        • 2.Qh2#
      • 1...d4!
    • 1.Qxf3?
      • threat
        • 2.Qg3#
        • 2.Qf4#
        • 2.Qf6#
      • 1...exd3
        • 2.Qe3#
        • 2.Qf4#
      • 1...d4
        • 2.Qxe4#
      • 1...exf3!
    • 1.Qd2?
      • threat
        • 2.Qf4#
      • 1...Sh2+
        • 2.Qxh2#
      • 1...d4
        • 2.Qa5#
      • 1...e3
        • 2.Qxe3#
      • 1...Sxd2!
    • 1.Qf2?
      • threat
        • 2.Qg3#
      • 1...Sh2+
        • 2.Qxh2#
      • 1...exd3
        • 2.Qe3#
      • 1...d4!
    • 1.Qe3?
      • threat
        • 2.Qf4#
      • 1...d4
        • 2.Qxe4#
      • 1...Sh2+!
  • Keys
    • 1.Ba6!
      • 1...Sh2+
        • 2.Qxh2#
      • 1...e3
        • 2.Qxe3#
      • 1...d4
        • 2.Qb5#
      • 1...Se1
        • 2.Qh2#
      • 1...Sg1
        • 2.Qh2#
      • 1...Sd2
        • 2.Qh2#
      • 1...Sd4
        • 2.Qh2#
      • 1...Sh4
        • 2.Qh2#
      • 1...Sg5
        • 2.Qh2#

This anticipates 27879(2001)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAB(B)
    • S(a);CHECK,N_GUARD::QAB(B),XS(a)
    • P(b);OGATEB::QAR2(B),XP(b)
    • P(c);N_GUARD::QAR1(B),XP(b)
  • Tries
    • Try
      • B(C);
      • Vars
        • S(a);CHECK,N_GUARD::QAB(B),XS(a)
        • P(b);OGATEB::QAR2(B),XP(b)
        • S(a);N_GUARD::QAB(B)
      • Refutation
        • P(c);
    • Try
      • Q(B);N_PINP(b),XS(a)
      • Threat
        • DUALS(3)
      • Vars
        • P(c);N_GUARD::QAR1(B),XP(b)
      • Refutation
        • P(b);XQ(B)
    • Try
      • Q(B);N_PINP(b)
      • Threat
        • QAB1(B)
      • Vars
        • S(a);CHECK,N_GUARD::QAB(B),XS(a)
        • P(c);OGATEB::QAR(B)
        • P(b);OGATEB::QAR2(B),XP(b)
      • Refutation
        • S(a);XQ(B)
    • Try
      • Q(B);N_PINP(b)
      • Threat
        • QAB(B)
      • Vars
        • S(a);CHECK,N_GUARD::QAB(B),XS(a)
        • P(b);OGATEB,XB(C)::QAR2(B)
      • Refutation
        • P(c);
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • P(c);N_GUARD::QAR1(B),XP(b)
      • Refutation
        • S(a);CHECK
  • Actual
    • B(C);
    • Vars
      • S(a);CHECK,N_GUARD::QAB(B),XS(a)
      • P(b);OGATEB::QAR2(B),XP(b)
      • P(c);OGATEB::QAR(B)
      • S(a);N_GUARD::QAB(B)
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