MESON Chess Problem Database

Problem Display
PID: 60143 (4K3/4b3/8/8/3Q4/k7/1RP2n2/q1r5 w - - 0 1)

Grunfeld, Max

Highly Comm., Brisbane Courier, 1928

4K3/4b3/8/8/3Q4/k7/1RP2n2/q1r5

#2

4 + 5

5454 Near Snap 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Bb4
      • 2.Qxb4#
    • 1...Bh4
      • 2.Qb4#
    • 1...Bg5
      • 2.Qb4#
    • 1...Bf6
      • 2.Qb4#
    • 1...Bd8
      • 2.Qb4#
  • Tries
    • 1.Qe3+?
      • 1...Kxb2
        • 2.Qb3#
      • 1...Ka4
        • 2.Qa7#
      • 1...Sd3!
    • 1.Qb6?
      • threat
        • 2.Qb3#
      • 1...Ka4
        • 2.Qa7#
        • 2.Qa6#
      • 1...Qxb2
        • 2.Qa5#
      • 1...Bb4
        • 2.Qxb4#
      • 1...Qa2!
    • 1.Qd3+?
      • 1...Kxb2
        • 2.Qb3#
      • 1...Ka4
        • 2.Qa6#
      • 1...Sxd3!
    • 1.Qa4+?
      • 1...Kxb2
        • 2.Qb3#
      • 1...Kxa4!
    • 1.Qc4?
      • threat
        • 2.Qb3#
      • 1...Kxb2
        • 2.Qb3#
      • 1...Qa2
        • 2.Rxa2#
        • 2.Qxa2#
      • 1...Qxb2!
  • Keys
    • 1.Qd5!
      • threat
        • 2.Qb3#
      • 1...Kxb2
        • 2.Qb3#
      • 1...Ka4
        • 2.Qa8#
      • 1...Qxb2
        • 2.Qa5#
      • 1...Qa2
        • 2.Qxa2#

Anticipated by 196747(1919)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • B(e);N_GUARD::QAB1(C),XB(e)
    • B(e);N_GUARD::QAB1(C)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(d);S_FLIGHT,XR(A)::QAR1(C)
        • K(d);P-FLIGHT::QAR(C)
      • Refutation
        • S(c);P_SPINS(c)
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • Q(a);SBLOCK,XR(A)::QAR2(C)
        • B(e);N_GUARD::QAB1(C),XB(e)
      • Refutation
        • Q(a);
    • Try
      • Q(C);CHECK
      • Vars
        • K(d);S_FLIGHT,XR(A)::QAR1(C)
        • K(d);P-FLIGHT::QAR2(C)
      • Refutation
        • S(c);XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(d);S_FLIGHT,XR(A)::QAR1(C)
      • Refutation
        • K(d);P-FLIGHT,XQ(C)
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • K(d);S_FLIGHT,XR(A)::QAR1(C)
      • Refutation
        • Q(a);XR(A)
  • Actual
    • Q(C);
    • Threat
      • QAR1(C)
    • Vars
      • K(d);S_FLIGHT,XR(A)::QAR1(C)
      • K(d);P-FLIGHT::QAR(C)
      • Q(a);SBLOCK,XR(A)::QAR2(C)
      • Q(a);N_GUARD::QAR1(C),XQ(a)
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