MESON Chess Problem Database

Problem Display
PID: 202410 (2r1R1N1/b2npP2/Q1B1k1P1/1p1nP3/1p2Pr1q/1N2pR2/2K2p2/B7 w - - 0 1)

van Rede, C

1st HM., Good Companions, 1923

2r1R1N1/b2npP2/Q1B1k1P1/1p1nP3/1p2Pr1q/1N2pR2/2K2p2/B7

#2

12 + 12

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rg4
      • 2.exd5#
    • 1...Rf5
      • 2.exd5#
      • 2.exf5#
    • 1...Rf6
      • 2.exd5#
    • 1...Rxf7
      • 2.exd5#
    • 1...Rxc6+
      • 2.Qxc6#
    • 1...Ra8
      • 2.Bxd5#
    • 1...Rb8
      • 2.Bxd5#
    • 1...Rd8
      • 2.Bxd5#
    • 1...Rxe8
      • 2.Bxd5#
    • 1...Bc5
      • 2.Bxd5#
    • 1...S5f6
      • 2.Rxe7#
    • 1...Sc7
      • 2.Bd5#
    • 1...Sb6
      • 2.Sc5#
    • 1...S7f6
      • 2.f8S#
  • Tries
    • 1.Sc5+?
      • 1...Bxc5
        • 2.Bxd5#
      • 1...Sxc5!
    • 1.f8S+?
      • 1...Rxf8
        • 2.exd5#
      • 1...Sxf8!
  • Keys
    • 1.Qxb5!
      • threat
        • 2.Qxd5#
      • 1...Rxc6+
        • 2.Qxc6#
      • 1...Bc5
        • 2.Bxd5#
        • 2.Bxd7#
      • 1...Sc3
        • 2.Bxd7#
      • 1...S5b6
        • 2.Sd4#
      • 1...S5f6
        • 2.Rxe7#
      • 1...Sc7
        • 2.Bxd7#
      • 1...Sc5
        • 2.Bxd5#
      • 1...S7b6
        • 2.Sc5#
      • 1...S7f6
        • 2.f8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • R(d);::P(E),XS(g)
    • R(d);XP(J)::P(E),XS(g)
    • R(l);CHECK,OGATE,P_SPINR(l),XB(H)::QAR2(G),XR(l)
    • R(l);N_PINB(H)::QAR(G)+B(H),DCHECK,XS(g)
    • R(l);N_PINB(H),N_SPINP(k),XR(K)::QAR(G)+B(H),DCHECK,XS(g)
    • B(i);N_PINB(H)::QAR(G)+B(H),DCHECK,XS(g)
    • S(g);N_GUARD,S_CUTQ(e)::R1(K),XP(k)
    • S(g);N_PINB(H)::QAR(G)+B(H),DCHECK
    • S(j);N_GUARD,S_CUTB(i)::S(C)
    • S(j);N_GUARD,S_CUTR(d)::P=S
  • Tries
    • Try
      • S(C);CHECK,N_SPINB(H)
      • Vars
        • B(i);XS(C)::QAR(G)+B(H),DCHECK,XS(g)
      • Refutation
        • S(j);XS(C)
    • Try
      • P(J);CHECK
      • Vars
        • R(d);XS(J)::P(E),XS(g)
      • Refutation
        • S(j);XS(J)
  • Actual
    • Q(G);XP(f)
    • Threat
      • QAB1(G),XS(g)
    • Vars
      • R(l);CHECK,OGATE,XB(H)::QAR2(G),XR(l)
      • S(g);N_PINB(H)::B(H),XS(j)
      • S(g);S_CUTB(i)::S(C)
      • S(g);N_GUARD,S_CUTQ(e)::R1(K),XP(k)
      • S(j);N_PINB(H)::B(H),XS(g)
      • S(j);N_GUARD,S_CUTB(i)::S(C)
      • S(j);N_GUARD,S_CUTR(d)::P=S
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