MESON Chess Problem Database

Problem Display
PID: 11240 (8/8/8/2p5/2P5/K4B1N/PnQp2N1/b4k2 w - - 0 1)

Hartong, Jan

De Schaakwereld, 1937

8/8/8/2p5/2P5/K4B1N/PnQp2N1/b4k2

#2

7 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.Qxd1#
      • 2.Qd3#
    • 1...Sd3
      • 2.Qxd3#
    • 1...Sa4
      • 2.Qd1#
      • 2.Qd3#
    • 1...Sxc4+
      • 2.Qxc4#
    • 1...d1Q
      • 2.Qf2#
    • 1...d1S
      • 2.Qe2#
    • 1...d1B
      • 2.Qf2#
    • 1...d1R
      • 2.Qe2#
      • 2.Qf2#
  • Tries
    • 1.Qe4?
      • threat
        • 2.Be2#
        • 2.Qe2#
      • 1...Sxc4+
        • 2.Qxc4#
      • 1...d1B
        • 2.Qe1#
      • 1...d1Q!
    • 1.Qxb2?
      • 1...d1Q
        • 2.Qf2#
      • 1...d1S
        • 2.Qe2#
      • 1...d1B
        • 2.Qf2#
      • 1...d1R
        • 2.Qe2#
        • 2.Qf2#
      • 1...Bxb2+!
    • 1.Qxd2?
      • threat
        • 2.Se3#
        • 2.Qe1#
        • 2.Qe2#
        • 2.Qf2#
      • 1...Sd1
        • 2.Qe1#
        • 2.Qxd1#
        • 2.Qe2#
        • 2.Qd3#
      • 1...Sd3
        • 2.Se3#
        • 2.Qe2#
        • 2.Qxd3#
      • 1...Sxc4+!
  • Keys
    • 1.Qc3!
      • 1...Sxc4+
        • 2.Qxc4#
      • 1...d1Q
        • 2.Se3#
      • 1...d1S
        • 2.Qe1#
      • 1...d1B
        • 2.Se3#
        • 2.Qe1#
      • 1...d1R
        • 2.Se3#
      • 1...Sd1
        • 2.Qd3#
      • 1...Sd3
        • 2.Qxd3#
      • 1...Sa4
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • S(c);N_GUARD::QAB(B),XS(c)
    • S(c);CHECK,OGATE,XP(G)::QAB(B),XS(c)
    • P(d);OGATE::QAR1(B)
    • P(d);OGATE::QAB1(B)
  • Tries
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • S(c);CHECK,OGATE,XP(G)::QAB(B),XS(c)
        • P(d);N_GUARD::QAR1(B)
      • Refutation
        • P(d);
    • Try
      • Q(B);XS(c)
      • Vars
        • P(d);OGATE::QAR1(B)
        • P(d);OGATE::QAB1(B)
      • Refutation
        • B(a);CHECK,XQ(B)
    • Try
      • Q(B);XP(d)
      • Threat
        • DUALS(4)
      • Refutation
        • S(c);CHECK,XP(G)
  • Actual
    • Q(B);
    • Vars
      • S(c);CHECK,OGATE,XP(G)::QAB(B),XS(c)
      • P(d);::S(C)
      • P(d);OGATE::QAR1(B)
      • S(c);N_GUARD::QAB(B)
      • S(c);N_GUARD::QAB(B),XS(c)
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