MESON Chess Problem Database

Problem Display
PID: 234534 (8/1b3K1p/2p5/Q3pk2/3R4/8/8/2B4n w - - 0 1)

Speckmann, Werner

Deutsche Schachzeitung, 1963

8/1b3K1p/2p5/Q3pk2/3R4/8/8/2B4n

#2

4 + 6

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Qe1?
      • threat
        • 2.Qe4#
      • 1...exd4
        • 2.Qe6#
      • 1...e4
        • 2.Qxe4#
      • 1...Sf2
        • 2.Qxf2#
      • 1...Sg3
        • 2.Qf2#
      • 1...c5!
    • 1.Qd2?
      • threat
        • 2.Qg5#
      • 1...exd4
        • 2.Qf4#
      • 1...h6!
    • 1.Qd8?
      • threat
        • 2.Qg5#
        • 2.Qf6#
        • 2.Qd7#
      • 1...e4
        • 2.Qg5#
      • 1...Bc8
        • 2.Qg5#
        • 2.Qf6#
        • 2.Qxc8#
      • 1...h6
        • 2.Qf6#
        • 2.Qd7#
      • 1...exd4!
    • 1.Qd5?
      • threat
        • 2.Qf3#
        • 2.Qe4#
        • 2.Qe6#
        • 2.Qd7#
      • 1...Bc8
        • 2.Qf3#
        • 2.Qe4#
      • 1...Sf2
        • 2.Qf3#
        • 2.Qe6#
        • 2.Qd7#
      • 1...Sg3
        • 2.Qf3#
        • 2.Qe6#
        • 2.Qd7#
      • 1...c5
        • 2.Qe6#
        • 2.Qd7#
      • 1...cxd5!
  • Keys
    • 1.Qc7!
      • threat
        • 2.Qd7#
      • 1...exd4
        • 2.Qf4#
      • 1...e4
        • 2.Qf4#
      • 1...Bc8
        • 2.Qxc8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(C);N_PINP(b)
      • Threat
        • QAB1(C)
      • Vars
        • P(b);OGATE,XR(B)::QAB1(C)
        • P(b);::QAB1(C),XP(b)
        • S(a);N_GUARD::QAR(C),XS(a)
        • S(a);N_GUARD::QAR(C)
      • Refutation
        • P(d);
    • Try
      • Q(C);N_PINP(b)
      • Threat
        • QAR1(C)
      • Vars
        • P(b);N_GUARD,XR(B)::QAR1(C)
      • Refutation
        • P(f);
    • Try
      • Q(C);N_PINP(b)
      • Threat
        • DUALS(3)
      • Vars
        • P(b);::QAR1(C)
      • Refutation
        • P(b);XR(B)
    • Try
      • Q(C);
      • Threat
        • DUALS(4)
      • Refutation
        • P(d);N_SPINP(b),XQ(C)
  • Actual
    • Q(C);N_PINP(b)
    • Threat
      • QAB(C)
    • Vars
      • P(b);OGATE,XR(B)::QAR1(C)
      • P(b);OGATE::QAR1(C)
      • B(e);N_GUARD::QAB(C),XB(e)
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