MESON Chess Problem Database

Problem Display
PID: 87449 (4R3/7q/8/b1B3Q1/2p1N1B1/2r1N1p1/1pP3p1/1K2k2r w - - 0 1)

Braithwaite, Kenneth Holmes

The Problemist, 1983

4R3/7q/8/b1B3Q1/2p1N1B1/2r1N1p1/1pP3p1/1K2k2r

#2

8 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rf1
      • 2.Sxg2#
  • Tries
    • 1.Sxg3?
      • threat
        • 2.Sxg2#
      • 1...Kd2+
        • 2.Sef1#
      • 1...Qxc2+
        • 2.Sxc2#
      • 1...Rxe3
        • 2.Qxe3#
      • 1...g1Q
        • 2.Sg2#
      • 1...g1S
        • 2.Sg2#
      • 1...g1B
        • 2.Sg2#
      • 1...g1R
        • 2.Sg2#
      • 1...Kf2+!
  • Keys
    • 1.Sd2!
      • threat
        • 2.Sxg2#
      • 1...Kxd2+
        • 2.Sf1#
      • 1...Kf2+
        • 2.Sd1#
      • 1...Qxc2+
        • 2.Sxc2#
      • 1...Rxe3
        • 2.Qxe3#
      • 1...g1Q
        • 2.Sg2#
      • 1...g1S
        • 2.Sg2#
      • 1...g1B
        • 2.Sg2#
      • 1...g1R
        • 2.Sg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 1
  • Sets
    • R(b);SBLOCK::S(C),XP(d)
  • Tries
    • Try
      • S(D);P_SPINP(B),XP(f)
      • Threat
        • R(H)+S(C),DCHECK,XP(d)
      • Vars
        • K(a);CHECK,S_FLIGHT::QAB(G)+S(C),DCHECK
        • Q(i);CHECK,XP(B)::R(H)+S(C),DCHECK,XQ(i)
        • R(e);OGATE,P_SPINR(e),XS(C)::QAR2(G),XR(e)
        • P(d);::R(H)+S(C),DCHECK
      • Refutation
        • K(a);CHECK,S_FLIGHT
  • Actual
    • S(D);P_SPINP(B)
    • Threat
      • R(H)+S(C),DCHECK,XP(d)
    • Vars
      • K(a);CHECK,S_FLIGHT,XS(D)::QAB(G)+S(C),DCHECK
      • K(a);CHECK,S_FLIGHT::B(F)+S(C),DCHECK
      • Q(i);CHECK,XP(B)::R(H)+S(C),DCHECK,XQ(i)
      • R(e);OGATE,P_SPINR(e),XS(C)::QAR2(G),XR(e)
      • P(d);::R(H)+S(C),DCHECK
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