MESON Chess Problem Database

Problem Display
PID: 189902 (1Q5K/7B/8/8/2p5/7p/1R1R1n1r/b1k5 w - - 0 1)

McAllister, George W

Pittsburgh Gazette-Times, 1912

1Q5K/7B/8/8/2p5/7p/1R1R1n1r/b1k5

#2

5 + 6

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Bxb2+
      • 2.Qxb2#
    • 1...c3
      • 2.Rbc2#
  • Tries
    • 1.Kg8?
      • threat
        • 2.Rbc2#
      • 1...Bxb2
        • 2.Qxb2#
      • 1...Rg2+!
    • 1.Qb3?
      • threat
        • 2.Qc2#
        • 2.Qxc4#
        • 2.Qc3#
      • 1...Bxb2+
        • 2.Qxb2#
      • 1...Sd1
        • 2.Rxd1#
        • 2.Qxd1#
        • 2.Qc2#
      • 1...Se4
        • 2.Rd1#
        • 2.Qd1#
        • 2.Qc2#
      • 1...c3
        • 2.Rbc2#
        • 2.Qc2#
        • 2.Qxc3#
      • 1...cxb3!
  • Keys
    • 1.Qf4!
      • threat
        • 2.Qxc4#
      • 1...Bxb2+
        • 2.Rd4#
      • 1...Sd1
        • 2.Rc2#
      • 1...Se4
        • 2.Qf1#
      • 1...c3
        • 2.Rb1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • B(a);CHECK,OGATE,XR(A)::QAB1(D),XB(a)
    • P(f);N_PINR(A)::R1(A)
  • Tries
    • Try
      • K(E);N_SPINR(A),P-FLIGHT
      • Threat
        • R1(A)
      • Vars
        • B(a);OGATE,XR(A)::QAB1(D),XB(a)
      • Refutation
        • R(d);CHECK
    • Try
      • Q(D);
      • Threat
        • DUALS(3)
      • Vars
        • B(a);CHECK,OGATE,XR(A)::QAB1(D),XB(a)
      • Refutation
        • P(f);XQ(D)
  • Actual
    • Q(D);
    • Threat
      • QAR(D),XP(f)
    • Vars
      • B(a);CHECK,SBLOCK,XR(A)::QAB(D)+R(B)
      • S(c);SBLOCK::QAB(D)+R(B),DCHECK
      • S(c);OGATE::QAR(D)
      • P(f);N_PINR(A)::R1(A)
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