MESON Chess Problem Database

Problem Display
PID: 271981 (2Q5/8/7B/8/1KR5/1p1rNrN1/2pk1p2/n4R2 w - - 0 1)

Brill, Robert C

The Problemist, 1957

2Q5/8/7B/8/1KR5/1p1rNrN1/2pk1p2/n4R2

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Rdxe3
      • 2.Rd4#
      • 2.Qd7#
      • 2.Qd8#
    • 1...Rd4
      • 2.Rxd4#
    • 1...Rd7
      • 2.Qxd7#
    • 1...Rd8
      • 2.Qxd8#
    • 1...c1S
      • 2.Rd1#
    • 1...c1B
      • 2.Rd1#
  • Tries
    • 1.Rxc2+?
      • 1...bxc2
        • 2.Sc4#
      • 1...Sxc2+!
    • 1.Re4?
      • threat
        • 2.Sc4#
      • 1...Rd4+
        • 2.Rxd4#
      • 1...Rdxe3
        • 2.Rd4#
        • 2.Qd7#
        • 2.Qc3#
        • 2.Qd8#
      • 1...Rc3
        • 2.Qxc3#
      • 1...Rd5
        • 2.Qc3#
      • 1...Rd6
        • 2.Qc3#
      • 1...Rd7
        • 2.Qxd7#
        • 2.Qc3#
      • 1...Rd8
        • 2.Qc3#
        • 2.Qxd8#
      • 1...c1Q
        • 2.Qxc1#
      • 1...c1S
        • 2.Rd1#
        • 2.Qxc1#
      • 1...c1B
        • 2.Rd1#
        • 2.Qxc1#
      • 1...c1R
        • 2.Qxc1#
      • 1...Rfxe3!
  • Keys
    • 1.Rf4!
      • threat
        • 2.Sc4#
      • 1...Rd4+
        • 2.Rxd4#
      • 1...Kxe3
        • 2.Re4#
      • 1...Rdxe3
        • 2.Rd4#
      • 1...Rfxe3
        • 2.R4xf2#
      • 1...Rxg3
        • 2.R4xf2#
      • 1...Rc3
        • 2.Qxc3#
      • 1...Rd5
        • 2.Qc3#
      • 1...Rd6
        • 2.Qc3#
      • 1...Rd7
        • 2.Qc3#
      • 1...Rd8
        • 2.Qc3#
      • 1...c1Q
        • 2.Qxc1#
      • 1...c1S
        • 2.Qxc1#
      • 1...c1B
        • 2.Qxc1#
      • 1...c1R
        • 2.Qxc1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 9
    • REMOVED MATES = 0
  • Sets
    • R(f);OGATEB,P_PINR(E)::R(E),XR(f)
    • R(f);OGATEB::QAR(G),XR(f)
    • P(b);N_GUARD::R1(A)
  • Tries
    • Try
      • R(E);CHECK,XP(b)
      • Vars
        • P(e);SBLOCK,XR(E)::B(F)+S(B),DCHECK
      • Refutation
        • S(a);CHECK,XR(E)
    • Try
      • R(E);
      • Threat
        • B(F)+S(B),DCHECK
      • Vars
        • R(f);CHECK,OGATEB::R(E),XR(f)
        • R(f);N_GUARD::QAB1(G),XR(f)
        • R(f);N_GUARD::QAB1(G)
        • P(b);OGATE::QAB1(G),XQ(b)
        • P(b);OGATE::QAB1(G),XR(b)
      • Refutation
        • R(g);P_SPINR(g),XS(B)
  • Actual
    • R(E);
    • Threat
      • S(B)
    • Vars
      • R(f);CHECK,OGATEB::R(E),XR(f)
      • K(c);OGATEB,S_FLIGHT,XS(B)::B(F)+R(E),DCHECK
      • R(f);OGATEB,XS(B)::R(E)
      • R(g);OGATE,XS(B)::R(E),XP(d)
      • R(g);OGATE,XS(C)::R(E),XP(d)
      • R(f);N_GUARD::QAB1(G),XR(f)
      • R(f);N_GUARD::QAB1(G)
      • P(b);OGATE::QAB1(G),XQ(b)
      • P(b);OGATE::QAB1(G),XS(b)
      • P(b);OGATE::QAB1(G),XB(b)
      • P(b);OGATE::QAB1(G),XR(b)
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