MESON Chess Problem Database

Problem Display
PID: 100980 (8/2Q2p2/8/2Nk2n1/1p6/2bB4/8/3R3K w - - 0 1)

Greenwood, William M

Good Companions, 1920

8/2Q2p2/8/2Nk2n1/1p6/2bB4/8/3R3K

#2

5 + 5

6490 yacpdb 2009
14620 Sunningdale Machine Gun Solving 2010

SOLUTION

  • SOUND
  • Tries
    • 1.Se4?
      • threat
        • 2.Qd6#
      • 1...Kd4
        • 2.Qc5#
      • 1...Sxe4
        • 2.Bc4#
      • 1...Be5
        • 2.Qc4#
      • 1...Ke6!
    • 1.Bf1+?
      • 1...Bd2
        • 2.Rxd2#
      • 1...Bd4!
    • 1.Be2+?
      • 1...Bd2
        • 2.Rxd2#
      • 1...Bd4!
    • 1.Bb5+?
      • 1...Bd2
        • 2.Rxd2#
      • 1...Bd4!
    • 1.Ba6+?
      • 1...Bd2
        • 2.Rxd2#
      • 1...Bd4!
  • Keys
    • 1.Sb7!
      • threat
        • 2.Qd6#
      • 1...Kd4
        • 2.Qc5#
      • 1...Ke6
        • 2.Qd6#
      • 1...Be5
        • 2.Qc4#
      • 1...Se4
        • 2.Bc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(D);
      • Threat
        • QAR1(E)
      • Vars
        • K(c);P-FLIGHT::QAB1(E)
        • S(d);SBLOCK,XS(D)::R(A)+B(C),DCHECK
        • B(a);SBLOCK::QAB1(E)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • B(C);CHECK
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::R(A),XB(a)
      • Refutation
        • B(a);P_SPINB(a)
    • Try
      • B(C);CHECK
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::R(A),XB(a)
      • Refutation
        • B(a);P_SPINB(a)
    • Try
      • B(C);CHECK
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::R(A),XB(a)
      • Refutation
        • B(a);P_SPINB(a)
    • Try
      • B(C);CHECK
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::R(A),XB(a)
      • Refutation
        • B(a);P_SPINB(a)
  • Actual
    • S(D);
    • Threat
      • QAR1(E)
    • Vars
      • K(c);P-FLIGHT::QAB1(E)
      • K(c);S_FLIGHT::QAR1(E)
      • B(a);SBLOCK::QAB1(E)
      • S(d);SBLOCK::R(A)+B(C),DCHECK
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