MESON Chess Problem Database

Problem Display
PID: 101198 (4R1bq/8/2KBr3/8/2QPk1B1/8/8/3Nr3 w - - 0 1)

Rothstein, Louis

Good Companions, 1918

4R1bq/8/2KBr3/8/2QPk1B1/8/8/3Nr3

#2

7 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qe5
      • 2.dxe5#
    • 1...Qh1
      • 2.d5#
    • 1...Qh2
      • 2.d5#
    • 1...Qh3
      • 2.d5#
    • 1...Qh4
      • 2.d5#
    • 1...Qh5
      • 2.d5#
    • 1...Qh6
      • 2.d5#
    • 1...Qh7
      • 2.d5#
    • 1...Re3
      • 2.Sf2#
    • 1...Re5
      • 2.d5#
  • Tries
    • 1.Rxe6+?
      • 1...Qe5
        • 2.dxe5#
        • 2.d5#
      • 1...Bxe6!
  • Keys
    • 1.Kc5!
      • threat
        • 2.Qc2#
      • 1...Qxd4+
        • 2.Qxd4#
      • 1...Qe5+
        • 2.dxe5#
      • 1...Qh5+
        • 2.d5#
      • 1...Re5+
        • 2.d5#
      • 1...Rxd1
        • 2.Qe2#
      • 1...Qh2
        • 2.d5#
      • 1...Qh3
        • 2.d5#
      • 1...Re2
        • 2.Qxe2#
      • 1...Re3
        • 2.Sf2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • Q(e);N_SPINR(c),OGATE::QAR(B)+P(C),XQ(e)
    • Q(e);N_GUARD::QAR(B)+P(C)
    • R(a);SBLOCK::S(A)
    • R(c);N_PINB(F),S_CUTQ(e)::QAR(B)+P(C)
  • Tries
    • Try
      • R(G);CHECK,N_SPINB(F),XR(c)
      • Refutation
        • B(d);XR(G)
  • Actual
    • K(E);N_SPINB(F),P-FLIGHT
    • Threat
      • QAB(B)
    • Vars
      • Q(e);CHECK,OGATE,P_SPINQ(e),XP(C)::QAR1(B),XQ(e)
      • Q(e);CHECK,N_SPINR(c),OGATE::QAR(B)+P(C),XQ(e)
      • Q(e);CHECK,N_GUARD::QAR(B)+P(C)
      • R(c);CHECK,S_CUTQ(e)::QAR(B)+P(C)
      • R(a);N_GUARD,XS(A)::QAR2(B)
      • Q(e);N_GUARD::QAR(B)+P(C)
      • R(a);N_GUARD::QAR2(B),XR(a)
      • R(a);SBLOCK::S(A)
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